Related Clues:
- Viper's warning
- Sound of a soda can opening
- Adder's warning
- Deflation indication
- Threatened snake's sound
- Org. protested by 10-Down
- Sound you don't want to hear from a tire
- Draft board inits.
- Snaky communication
- Boo accompanier
- Draft card letters
- Frying sound
- Theater jeer
- Registration agcy.
- Military draft org.