Boring place to live? (4)
I believe the answer is:
flat
This clue is a double definition.
'boring' is the first definition.
(flat can mean dull or lifeless)
'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 - uninteresting - accommodation" , "Even -- pitched too low" , "Small residence - lacking sparkle" , "Not hilly" , "like some races" .)