Moved to balmier US city (9)
I believe the answer is:
baltimore
'us city' is the definition.
(city in Maryland, USA)
'moved to balmier' is the wordplay.
'moved' is an anagram indicator.
'to'+'balmier'='tobalmier'
'tobalmier' is an anagram of 'BALTIMORE'.
(Other definitions for baltimore that I've seen before include "US city" , "Large city in Maryland" , "City of north Maryland" , "Port on Chesapeake Bay" , "Largest city of Maryland, USA" .)