A question that's full of holes? (6)
I believe the answer is:
riddle
'a question' is the definition.
(riddle is a kind of question)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for riddle that I've seen before include "Question to test ingenuity, something puzzling" , "unsolved problem" , "Sieve or conundrum" , "it's full of holes" , "It may have an answer" .)