Top chamber (5)
I believe the answer is:
attic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">top chamber</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 attic that I've seen before include "Greek - garret" , "Classically elegant" , "Room at the top of a house" , "Top chamber" , "Ancient Greek; loft" .)