One particularly horrendous example of a vote to close as "unclear" followed by an answer posted by the user can be found at Is there a purely political explanation of "race"?, which makes absolutely no sense.
The question is either clear to the user in spite of their casting a vote to close as "unclear", or the user could not resist their urge to answer a question which was not clear to them.
Even after editing the question the user still argued that the question was not clear to them Is there a purely political explanation of "race"?.
Another example is this question As of June 26, 2018 is the United States at war?, where after answers were posted, users claimed that the question was not clear. This question was asked to narrow the scope of the feigned ignorance of what "war" is
What is the narrowest possible definition of war?, which was closed as well as "off-topic". Just answer the question if you understand the question, if not, your input is not constructive.
In either instance, the conduct appears to be fraudulent on its face.
"down" vote if you decide to. If you answer a question then vote to "close" citing the reason therefor being "unclear", or answer a question then vote to "close" as "unclear" - your actions are unclear. One option is to simply move on to another question instead of trying to answer a question which you do not understand, or try to squeeze the question into your understanding: It is possible that you do not have the capacity to understand the question or answer the question. Accept that fact and stop reading the question immediately.