American navy in Naples moved north (13)

I believe the answer is:

pennsylvanian

'american' is the definition.
(Pennsylvanian is an example)

'navy in naples moved north' is the wordplay.
'moved' indicates an anagram.
'north' becomes 'n' ('N' can be a synonym of 'north').
'navy'+'in'+'naples'='navyinnaples'
'navyinnaples' with letters rearranged gives 'pennsylvania'.
'pennsylvania'+'n'='PENNSYLVANIAN'

I've seen this clue in The Times.

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