Little bit of peach in trifle (4)
I believe the answer is:
hint
'little bit' is the definition.
(I've seen this in another clue)
'of peach in trifle' is the wordplay.
'of' says the answer is hidden in the clue.
'HINT' is hidden in the letters of 'peach in trifle'.
(Other definitions for hint that I've seen before include "Tip, clue" , "Taste" , "Small trace; clue" , "signal" , "Helpful suggestion" .)