Drink with a pin-up (3)
I believe the answer is:
nip
'drink' is the definition.
(I've seen this before)
'a pin-up' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'pin' written backwards gives 'NIP'.
'with' acts as a link.
(Other definitions for nip that I've seen before include "Pinch - tot" , "Catch" , "Pinch or squeeze sharply" , "Shot" , "Swift bite" .)