Overcome quiet clergyman with worry (7)
I believe the answer is:
prevail
'overcome' is the definition.
(thesaurus)
'quiet clergyman with worry' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'clergyman' becomes 'rev' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'worry' becomes 'ail' (I've seen this before).
'p'+'rev'+'ail'='PREVAIL'
(Other definitions for prevail that I've seen before include "Succeed ultimately" , "Be current" , "Gain mastery" , "Win through" , "Have opinion accepted" .)