Woman who takes a vow of poverty (3)
I believe the answer is:
nun
'woman who takes a vow of poverty' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nun that I've seen before include "Fancy pigeon variety" , "Female in religious order" , "Black and white pigeon" , "Woman in Holy Orders" , "Convent dweller" .)