Monastic quarters (4)
I believe the answer is:
cell
'monastic quarters' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cell that I've seen before include "Small room for confining a prisoner" , "The basic structural unit of all organisms" , "Part of a battery" , "Prisoner's or monk's room" , "Compartment in honeycomb" .)