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