Something to eat and drink quietly (4)
I believe the answer is:
rump
'something to eat' is the definition.
(rump is a kind of food)
'drink quietly' is the wordplay.
'drink' becomes 'rum' (rum is a kind of drink).
'quietly' becomes 'p' (p for piano and quiet).
'rum'+'p'='RUMP'
'and' acts as a link.
(Other definitions for rump that I've seen before include "The buttocks or hind-quarters" , "Depleted legislators" , "Backside" , "Seat" , "Animal's hind quarters" .)