Beg for quiet and go ahead (5)
I believe the answer is:
plead
'beg' is the definition.
(thesaurus)
'quiet and go ahead' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'and' means one lot of letters go next to another.
'go ahead' becomes 'lead' (I've seen this before).
'p'+'lead'='PLEAD'
'for' is the link.
(Other definitions for plead that I've seen before include "Present an argument in court" , "Say one is guilty or not guilty" , "advocate in court" , "Supplicate" , "Sue" .)