Ceiling (4)
I believe the answer is:
roof
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ceiling</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 roof that I've seen before include "Topmost part" , "Topping structure" , "Cover for building" , "Housetop" , "Upper limit; house top" .)