Copper gets bawdy post intended for clergyman (6)
I believe the answer is:
curacy
'post intended for clergyman' is the definition.
'copper gets bawdy' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'gets' means one lot of letters go next to another.
'bawdy' becomes 'racy'.
'cu'+'racy'='CURACY'
(Other definitions for curacy that I've seen before include "ministerial office" , "Position occupied by junior priest in parish" , "Minor clerical office" , "position for clergyman" , "Clergyman's office" .)