Sharp bite or pinch (3)
I believe the answer is:
nip
I believe this clue is a double definition.
'sharp bite' is the first definition.
(I've seen this in another clue)
'pinch' is the second definition.
(nip can mean to pinch or bite)
(Other definitions for nip that I've seen before include "pop and > have a bite" , "Small drink or small bite" , "Shot" , "little drink" , "Feeling cold" .)