Church gets a simple clergyman (8)
I believe the answer is:
chaplain
'clergyman' is the definition.
(I know that Chaplain is a type of clergyman)
'church gets a simple' is the wordplay.
'church' becomes 'ch' (abbreviation on maps etc).
'gets' means one lot of letters go next to another.
'simple' becomes 'plain' (associated in meaning).
'ch'+'a'+'plain'='CHAPLAIN'
(Other definitions for chaplain that I've seen before include "Forces' clergyman" , "Clergyman attached to an organisation" , "Religious minister assigned to an organisation" , "Christian clergyman attached to an institution, military body etc" , "cleric" .)