Crossword Genius

___ Marathon (annual mountain bike race that's said to be "a volcanic challenge") (4)

Ross

I believe the answer is:

etna

(Other definitions for etna that I've seen before include "one blowing top?" , "burning mountain" , "Threatening mountain" , "Neat class of volcano in Sicily" , "Active European volcano" .)

I've seen this clue in The New York Times.
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