Related Clues:

• Sibilant sound
• Sound after a pinprick
• Lottery org.
• Snake's sound
• Serpent sound
• Leaky radiator sound
• Sound at a fish fry
• Sound of a leak
• Old lottery org.
• It might precede 'pfft'
• Sound after a puncture
• Cat's warning
• 1960's demonstration target: Abbr.
• Draft inits.
• Draft dodgers' bane: Abbr.