Apartment; even (4)
I believe the answer is:
flat
I believe this clue is a double definition.
'apartment' is the first definition.
(I know that apartment can be written as flat)
'even' is the second definition.
(similar in meaning)
(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" .)