Snake killed by Hercules (5)

I believe the answer is:

hydra

(Other definitions for hydra that I've seen before include "Mythical many-headed snake" , "Monster Hercules slew" , "Many-headed snake slain by Hercules" , "Multi-headed monster killed by Hercules" , "Proliferating-head monster" .)

I've seen this clue in the King Feature Syndicate.

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