It towers over Taormina (4)
I believe the answer is:
etna
'it towers over taormina' 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 "Neat volcano overturned" , "Mount . . . . is a volcano in Sicily" , "Sicilian hothead?" , "A feature of Sicily" , "burning mountain" .)