Sicily's volcano (4)
I believe the answer is:
etna
'sicily's volcano' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for etna that I've seen before include "Highest peak in Italy south of the Alps" , "it may produce steam and ash" , "Neat kind of European volcano" , "Europe's highest active volcano" , "Long-term smoker" .)