Drink crush (6)
I believe the answer is:
squash
This clue is a double definition.
'drink' is the first definition.
(I've seen this before)
'crush' is the second definition.
(I know that crush can be written as squash)
(Other definitions for squash that I've seen before include "Game; crush, squeeze" , "Indoor racquet game" , "Orange drink" , "Soft drink" , "Flatten" .)