Put down roots around a US city (7)
I believe the answer is:
seattle
'us city' is the definition.
(I've seen this before)
'put down roots around a' is the wordplay.
'put down roots' becomes 'settle' (I've seen this before).
'around' is an insertion indicator.
'settle' enclosing 'a' is 'SEATTLE'.
(Other definitions for seattle that I've seen before include "Washington port" , "city in north-west America" , "Largest city in the state of Washington" , "Let's eat at this US city" , "? American seaport" .)