Church with a simple clergyman (8)
I believe the answer is:
chaplain
'clergyman' is the definition.
(I know that Chaplain is a type of clergyman)
'church with a simple' is the wordplay.
'church' becomes 'ch' (abbreviation on maps etc).
'with' is a charade indicator (letters next to each other).
'simple' becomes 'plain' (synonyms).
'ch'+'a'+'plain'='CHAPLAIN'
(Other definitions for chaplain that I've seen before include "Member of the clergy, in 24 ac say" , "'Member of the clergy, in a hospital, say (8)'" , "Clergyman attached to an institution, such as the army" , "man of God" , "cleric" .)