Remained behind fellow minister (8)
I believe the answer is:
chaplain
'minister' is the definition.
(I know that Chaplain is a type of minister)
'remained behind fellow' is the wordplay.
'remained' becomes 'lain' (I've seen this before).
'behind' means one lot of letters go next to another.
'fellow' becomes 'chap' (both can mean a man).
'lain' put after 'chap' is 'CHAPLAIN'.
(Other definitions for chaplain that I've seen before include "Army padre" , "'Member of the clergy, in a hospital, say (8)'" , "Member of the clergy, in 24 ac say" , "cleric" , "sky pilot" .)