Clergyman a dog devoured (6)
I believe the answer is:
curate
'clergyman' is the definition.
(assistant to a priest)
'a dog devoured' is the wordplay.
'a dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'devoured' becomes 'ate' (to devour is to eat).
'cur'+'ate'='CURATE'
(Other definitions for curate that I've seen before include "Organise exhibition" , "assistant rector" , "one wearing dog-collar" , "Clergyman assisting priest" , "junior cleric" .)