Isle in the Bay of Naples (5)
I believe the answer is:
capri
'isle in the bay of naples' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for capri that I've seen before include "Greek island" , "Neapolitan isle" , "I carp about the island" , "Island off Italy" , "holiday destination" .)