Salvages ruins in US city (3,5)
I believe the answer is:
las vegas
'us city' is the definition.
(I've seen this before)
'salvages ruins' is the wordplay.
'ruins' indicates an anagram.
'salvages' is an anagram of 'LAS VEGAS'.
'in' is the link.
(Other definitions for las vegas that I've seen before include "Gambling city in Nevada, USA" , "US gambling city" , "entertainment centre" , "US casino city" , "city surrounded by desert" .)