Alleges son destroyed city (3,7)
I believe the answer is:
los angeles
'city' is the definition.
(Los Angeles is an example)
'alleges son destroyed' is the wordplay.
'destroyed' indicates anagramming the letters.
'alleges'+'son'='allegesson'
'allegesson' anagrammed gives 'LOS ANGELES'.
(Other definitions for los angeles that I've seen before include "US city; Victoria de ---, soprano" , "California city" , "Californian city" , "centre of population" , "Big city" .)