Cloister resident (3)
I believe the answer is:
nun
'cloister resident' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nun that I've seen before include "Member of convent" , "Convent dweller" , "One in holy order" , "whose son entered Promised Land" , "eg Carmelite" .)