Pinch small drink of spirits (3)
I believe the answer is:
nip
This clue is a double definition.
'pinch' is the first definition.
('nip' can be a synonym of 'pinch')
'small drink of spirits' is the second definition.
(I've seen this before)
(Other definitions for nip that I've seen before include "smart" , "Quick, sharp, bite" , "Small drink or small bite" , "Shot" , "Dram of spirits" .)