Something easy about question causes resentment (5)
I believe the answer is:
pique
'resentment' is the definition.
(I've seen this in another clue)
'something easy about question' is the wordplay.
'something easy' becomes 'pie' (I've seen this in another clue).
'about' indicates putting letters inside.
'question' becomes 'qu' (abbreviation).
'pie' enclosing 'qu' is 'PIQUE'.
'causes' acts as a link.
(Other definitions for pique that I've seen before include "Nettle" , "Resentment at a slight" , "Offence taken" , "Resentful feeling" , "Stimulate (someone's interest)" .)