City of New Orleans (7)
I believe the answer is:
salerno
'city' is the definition.
(I have seen 'City of Campania' mean 'salerno' so perhaps 'city' could also mean 'salerno')
'new orleans' is the wordplay.
'new' indicates anagramming the letters.
'orleans' anagrammed gives 'SALERNO'.
'of' acts as a link.
(Other definitions for salerno that I've seen before include "in Italy!" , "Orleans (anag) - Italian port" , "Learn so as to go out to the Italian port city" , "Battle" , "South Italian port" .)