Question (5)
'question' is the definition.
(a poser is a difficult question)
This is the entire clue.
(Other definitions for poser that I've seen before include "one who has airs and graces" , "Brain-teaser" , "Problem set by the model" , "What's difficult" , "question master?" .)
'question' is the definition.
(I know that question can be written as query)
This is all the clue.
(Other definitions for query that I've seen before include "Doubt" , "Inquiry" , "(Pose a) question" , "Question mark (printing)" .)