Related Clues:

• Treacherous one
• Rattler, e.g.
• Slithery creature
• Grass denizen?
• Asp, e.g.
• Boa, for one
• Cobra, e.g.
• Treacherous type
• Serpent
• Asp or adder
• Clog clearer
• Eden figure
• Cobra or python
• See 16 Down
• River flowing from Yellowstone National Park