The crossword solution for the term Sicilian Hothead is ETNA, which is a reference to Mount Etna, an active stratovolcano on the east coast of Sicily. It is the highest and most active volcano in Europe and has been erupting for thousands of years. The term 'Sicilian Hothead' is often used to describe someone who is quick to anger, which is likely a reference to the fiery nature of Mount Etna.