Cowl wearer (4)
I believe the answer is:
monk
'cowl wearer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for monk that I've seen before include "One in a religious order" , "Tonsured person" , "Religious brother" , "Man in a religious order" , "Thelonious - - (jazz)" .)