Related Clues:

• Jock support?
• It'll give you a start
• Word from 22-Down?
• Derisive cry
• Shock giver
• Scary sound
• Audience put-down
• Show dissatisfaction
• Halloween sound
• Greet the villain appropriately
• 'Go team!'
• Encouraging cry
• Derisive exclamation
• Audience insult
• Shout of disapproval