Resolve to take a city (7)
I believe the answer is:
seattle
'city' is the definition.
(Seattle is an example)
'resolve to take a' is the wordplay.
'resolve' becomes 'settle' (settling is a kind of resolving).
'to take' means one lot of letters goes inside another.
'settle' placed around 'a' is 'SEATTLE'.
(Other definitions for seattle that I've seen before include "American city" , "US West coast port" , "coastal city" , "US Pacific seaport" , "Sleepless in --, film" .)