Hothead liable to blow top in Sicily? (4)

I believe the answer is:

etna

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'in sicily?' is the definition.
('Etna' is part of 'sicily')

I don't understand how the remainder of the clue works.

(Other definitions for etna that I've seen before include "Volcano in Sicily, quite neat" , "Highest peak in Italy south of the Alps" , "Dangerous peak" , "Volcano; reverse of stake" , "Threatening mountain" .)

I've seen this clue in The Telegraph.

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