Prison room (4)
I believe the answer is:
cell
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prison room</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cell that I've seen before include "Monastic room" , "Lock-up room" , "Basic unit of living matter" , "may be wet or dry?" , "Prisoner's or monk's room" .)