Assistant cleric (6)
I believe the answer is:
curate
'assistant cleric' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for curate that I've seen before include "Assistant clergyman" , "A truce (anag)" , "A truce for the church minister" , "He didn't really want an egg" , "Junior priest in a parish" .)