Messy room (3)
I believe the answer is:
sty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">messy 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 sty that I've seen before include "See 15" , "Pigs' pen" , "Farmyard enclosure" , "Pig's enclosure" , "Swinish place" .)