Dull place to live (4)
I believe the answer is:
flat
I believe this clue is a double definition.
'dull' is the first definition.
(similar in meaning)
'place to live' is the second definition.
(a flat or apartment is a kind of residence)
(Other definitions for flat that I've seen before include "Level - below the natural note" , "Small residence - lacking sparkle" , "one or more in uniform" , "Featureless" , "place to live" .)