Changing room (7)
I believe the answer is:
cubicle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">changing room</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cubicle that I've seen before include "Booth - kiosk" , "Small, private compartment" , "Partitioned-off part of room" , "bay" , "Cell" .)