Volcano rising in Italian territory (4)
I believe the answer is:
etna
'volcano' is the definition.
(Etna is an example)
'rising in italian territory' is the wordplay.
'rising' says the letters should be written backwards (going up in a down clue).
'in' indicates the answer is hidden within the clue.
'ante' is hidden in the letters of 'italian territory'.
'ante' backwards is 'ETNA'.
(Other definitions for etna that I've seen before include "Highest active volcano in Europe" , "Threatening mountain" , "Long-term smoker" , "Mount . . . . is a volcano in Sicily" , "Volcano in Italy" .)