In my opinion, and from my experience on the site, these question fall under 3.5 categories:
- The question doesn't have any merit and can't be salvaged
Those are mainly questions that are asking about definitions that make no sense in any context, for example the question "Is racism a psycho-spiritual disorder?" (https://skeptics.stackexchange.com/questions/15624/is-racism-a-psycho-spiritual-disorder), since the question asks about a gibberish definition that doesn't exists anywhere except for some very fringe non scientific (woo-woo) circles, this question can be replaced by a similar question "Is racism a Gravitational-Quantum-Fishy-Radiation disorder?" or "Is racism a bhajgdjashbsa?", and can't be answered under the scope of the requirements of this site.
In these cases, the OP should be given a chance to explain and give examples for the non-understandable concept, and if they can't then closed.
- The question is using a definition that doesn't apply to the case presented, or is too vage
Those are questions that ask "Is a crocodile greener or longer", or in a real example "Did the USSR have better tanks than Germany in WW2?" (Did the USSR have better tanks than Germany in WW2?), In those cases, once again the OP should be asked to give a more precise defenition of what they are asking, or to clerify their meaning, if an explanation doesn't come, then I think the best answer will cover all the possible sensible defenition, or just give an explantion of why this defenition isn't appropreate while trying to give an answer to the main subject.
So for the two examples, above, the crocodile answer should state that color and length can't be compared, but the average length of crocodiles is 6.1-7 meters, and the color of its skin is usually between some specific shades of green.
As for the tanks question, what I tried to show in my answer, is that tanks alone shouldn't be compared, but the whole system which operates them, which is the Army as a whole, and in the Case of WWII it's the entire nation, because tanks alone are meaningless, while providing stats for the tanks, like armament, speed and pros and cons of each side so that the question "which Tank is the fastest?" could also be answered.
- The question uses a not very well defined definition, but is still a viable question under the dictionary or popular definitions
Here the question about the slavery in Ireland falls, and I agree here with @Beofett that the question is about the working conditions of the women in those laundries. So the answer should state what were the working conditions of the women in the laundries, and then equate it to the definition of slavery, either the common, or the dictionary. And the end conclusion can be something along the lines of
While their condition doesn't match the dictionary definition of slavery, their conditions were very bad, and could be considered by some people as slavery, or almost slavery conditions
Their conditions weren't up to the standards set by the Irish laws at that time, but they don't come close to any definition of slavery.
Their conditions were in correlation with the Irish law and upheld it, so they weren't any worse than the condition of any other "lower class" worker in Ireland at the time.
(Confession: I didn't read the answer, so it may or may not be along these lines)
Another example is the answer to the question Is the Bible the most read book?, which states all the criteria it uses, all the assamption and states specificaly when it changes the defenition from the dictionary defenition to the common sence defenition:
If we expand the definition of "reading" to include listening to a live or recorded recitation, the Qur'an can claim a much larger, undocumented readership.
Lastly, the half category is:
One example, is a question I posted and was since deleted "Is there any truth in Feng shui", since the definition of Feng shui changes from place to place, and the claims they make are also changing and very broad, this site isn't suitable for those question.
I have encountered several other questions of this type and they were either narrowed down to a specific claim, or closed, and I think that this is the right course of action.
In any case always ask for a clarification from the OP.
Always look on questions through rose glasses and try to find a claim with merit that can be answered so that the answer can teach and enlighten the OP and other readers.
If a clear definition is needed and can't be found in the question, use a common sense definition while comparing it to other possible definitions.