Gorgon might have been amused (6)

I believe the answer is:

medusa

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'gorgon' is the definition.
(I know that Medusa is a type of gorgon)

'might have been amused' is the wordplay.
'amused' anagrams to 'MEDUSA'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for medusa that I've seen before include "Petrifying woman" , "Mythical woman transformed into a Gorgon" , "One of three sisters with snakes for hair" , "Gorgon slain by Perseus" , "Hideous female" .)

I've seen this clue in The Irish News.

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