Buzzer loud, leading to complaint (4)
I believe the answer is:
beef
'complaint' is the definition.
(I've seen this before)
'buzzer loud leading' is the wordplay.
'buzzer' becomes 'bee' (I've seen this before).
'loud' becomes 'f' (short for forte - 'loud' in music).
'leading' is a charade indicator (letters next to each other).
'bee'+'f'='BEEF'
'to' acts as a link.
(Other definitions for beef that I've seen before include "it's unacceptable for vegetarian" , "Meat of the cow" , "Bovine flesh" , "nickname of US State" , "Muscle; meat; grievance" .)