Monk's quarters (4)
I believe the answer is:
cell
'monk's quarters' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cell that I've seen before include "Biological unit with a nucleus" , "Small room for nun, monk or prisoner" , "Unit of animal or plant structure" , "Dungeon" , "Room in prison or monastery" .)