Planes diverted somewhere in Italy (6)
I believe the answer is:
naples
'somewhere in italy' is the definition.
The answer and definition can be both locations as well as being singular nouns.
I also know that 'italy' relates to this answer.
'planes diverted' is the wordplay.
'diverted' indicates an anagram (letters must be diverted to different positions).
'planes' with letters rearranged gives 'NAPLES'.
Can you help me to learn more?
(Other definitions for naples that I've seen before include "Mediterranean city" , "See it and die, they say" , "Major Italian city south of Rome" , "Italian port blockaded by Nelson" , "Planes go awry in Italian port" .)