Long leases arranged in US city (3,7)
I believe the answer is:
los angeles
'us city' is the definition.
(I've seen this before)
'long leases arranged' is the wordplay.
'arranged' is an anagram indicator.
'long'+'leases'='longleases'
'longleases' anagrammed gives 'LOS ANGELES'.
'in' is the link.
(Other definitions for los angeles that I've seen before include "centre of population" , "Second most populous city in the US" , "Hollywood city" , "Big city" , "American city" .)