Copper coming to charge clergyman (6)
I believe the answer is:
curate
'clergyman' is the definition.
(curate is a kind of clergyman)
'copper coming to charge' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'coming to' is a charade indicator (letters next to each other).
'charge' becomes 'rate' (rate is a kind of charge**).
'cu'+'rate'='CURATE'
(Other definitions for curate that I've seen before include "Acuter (anag.)" , "Church of England clergyman" , "assistant rector" , "Member of the clergy" , "His egg is said to be good in parts." .)