Related Clues:
- Serpent's warning
- Lottery-running org.
- Old draft letters
- Cobra's caution
- Snake's comment
- Sound after a pinprick, perhaps
- Reptilian warning
- Worrying sound to a balloonist
- Pressure cooker's sound
- Sound from a hot skillet
- Fizzle or sizzle sound
- Griddle sound
- Onetime "greetings" org.
- Mil. registration group
- Sound of bacon frying