Unexciting apartment (4)
I believe the answer is:
flat
This clue is a double definition.
'unexciting' is the first definition.
(I've seen this before)
'apartment' is the second definition.
(I know that apartment can be written as flat)
(Other definitions for flat that I've seen before include "Dull; set of rooms" , "Lacking interest" , "Level - below the natural note" , "Level; pad" , "Apartment; even" .)