A little drink with a pin-up (3)
I believe the answer is:
nip
'a little drink' is the definition.
(I've seen this before)
'pin-up' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'pin' back-to-front is 'NIP'.
'with a' is the link.
(Other definitions for nip that I've seen before include "Feeling cold" , "Pinch sharply, perhaps in the bud" , "little drink" , "pop and > have a bite" , "Pinch, short drink" .)