Accommodation for prisoners (5)
I believe the answer is:
cells
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">accommodation for prisoners</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cells that I've seen before include "Basic structural units of all organisms" , "Rooms for prisoners" , "Accommodation for prisoners" , "Small rooms" , "Dungeons" .)