Creature slain in the second labour of Hercules (5)

I believe the answer is:

hydra

(Other definitions for hydra that I've seen before include "Femme fatale of legend" , "Many-headed serpent" , "Greek island" , "Nine-headed monster of Greek myth" , "Mythological monster with nine heads" .)

I've seen this clue in The Sunday Times and The Times.

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