Pinch a drink! (3)
I believe the answer is:
nip
This clue is a double definition.
'pinch' is the first definition.
(synonyms)
'a drink' is the second definition.
(I've seen this before)
(Other definitions for nip that I've seen before include "Pinch using pin" , "Shot" , "Pinch or squeeze sharply" , "Quick, sharp, bite" , "Pinch; bite" .)