The only mortal Gorgon (6)

I believe the answer is:

medusa

(Other definitions for medusa that I've seen before include "One of three sisters with snakes for hair" , "Gorgon of Greek myth" , "all her visitors got stoned" , "Mythological gorgon" , "Gorgon with snakes for hair" .)

I've seen this clue in The Telegraph.

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