Sicilian hothead (4)
I believe the answer is:
etna
'sicilian hothead' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for etna that I've seen before include "Volcano in Italy" , "Italian smoker" , "Highest peak in Italy south of the Alps" , "Sicilian volcano" , "source of fumes?" .)