Perceptive answer, darling! (5)
I believe the answer is:
acute
'perceptive' is the definition.
(similar in meaning)
'answer darling' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'darling' becomes 'cute' (I've seen this in another clue).
'a'+'cute'='ACUTE'
(Other definitions for acute that I've seen before include "Keen, good or sharp, senses say" , "Critical, serious" , "Keen; severe" , "Canny" , "Sharp; severe" .)