A ruin I'm going to love in US city (8)
I believe the answer is:
amarillo
'us city' is the definition.
'a ruin i'm going to love' is the wordplay.
'ruin' becomes 'mar' (I've seen this before).
'i'm going to' becomes 'ill' ('I'm going to' can mean 'I will' or 'I'll').
'love' becomes 'o' (In tennis, 'love' means 'zero').
'a'+'mar'+'ill'+'o'='AMARILLO'
'in' is the link.
(Other definitions for amarillo that I've seen before include "Texan city made famous in the song ''Is this the way to ...''" , "City in northern Texas. Is this the way to it?" , "Texas panhandle city" , "There's a strange oil alarm in this Texan town" , "Oil alarm (anag) - Texas city" .)