Capital of Campania is not in part of England but somewhere in Italy (6)
I believe the answer is:
umbria
'in italy' is the definition.
('Umbria' is part of 'italy')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for umbria that I've seen before include "part of Italy" , "Italian region" , "hilly area of Italy" , "in the Tiber region" , "Mountainous region in central Italy" .)