Vocally expresses disapproval of alcoholic drink (5)
I believe the answer is:
booze
'alcoholic drink' is the definition.
'vocally expresses disapproval' is the wordplay.
'vocally' indicates a 'sounds like' (homophone) clue.
'expresses disapproval' becomes 'boos'.
'boos' is a homophone of 'BOOZE'.
'of' is the link.
(Other definitions for booze that I've seen before include "Consume alcohol" , "Drink heavily" , "Intoxicating liquor" , "Alcoholic liquor" , "In slang, alcoholic drink" .)