Upper room (5)
I believe the answer is:
attic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">upper room</span>' is the definition.<br/ ><span class="explanation-format__explanation">(room at the top of the house)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for attic that I've seen before include "Floor" , "from Greece" , "Top apartment" , "Athenian Greek" , "28 [GREEK]" .)