Apartment; even (4)
I believe the answer is:
flat
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">apartment</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that apartment can be written as flat)</span><br/ ><br/ >'<span class="explanation-format__original">even</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for flat that I've seen before include "Level - uninteresting - accommodation" , "Apartment; plane" , "razed to the ground, having had blow-out" , "Punctured tyre" , "Level - below the natural note" .)