Drink nothing, coming back for work (4)
I believe the answer is:
opus
'work' is the definition.
(I've seen this before)
'drink nothing coming back' is the wordplay.
'drink' becomes 'sup' (I've seen this before).
'nothing' becomes 'o' (looks like zero - 0).
'coming back' says the letters should be written backwards.
'sup'+'o'='supo'
'supo' in reverse letter order is 'OPUS'.
'for' acts as a link.
(Other definitions for opus that I've seen before include "Work (of a composer?)" , "(Numbered) musical composition" , "Artistic work" , "Major work" , "Composer's work" .)