Monster slain by Hercules (5)

I believe the answer is:

hydra

'monster slain by hercules' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for hydra that I've seen before include "Multi-headed monster slain by Hercules" , "Nine-headed monster killed by Hercules" , "Many-headed snake slain by Hercules" , "Monster Hercules slew" , "Femme fatale of legend" .)

I've seen this clue in the New York Times, the King Feature Syndicate, the Wall Street Journal, the L.A. Times Daily and The Washington Post.

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