Changing planes in Italy (6)
I believe the answer is:
naples
'in italy' is the definition.
('Naples' is part of 'italy')
'changing planes' is the wordplay.
'changing' indicates an anagram.
'planes' with letters rearranged gives 'NAPLES'.
(Other definitions for naples that I've seen before include "Planes go awry in Italian port" , "European city" , "City near Mt. Vesuvius" , "Planes (anag) - somewhere in Italy" , "See it and die, they say" .)