Related Clues:

• Move sinuously
• Plumbers' helpers
• Vipers
• Despicable person
• Hair of Medusa
• Blockage remover
• Deceitful sort
• Serpents
• Grass inhabitant?
• Coral, for one
• Double-crosser
• Plumber's tool
• Adder, e.g.
• Herpetology subject
• Jackson Hole's river