Related Clues:

• Fans' sound
• Endorse a statement, perhaps
• Cannon sound
• Threatening jungle sound
• Bestial bellow
• Give an ovation
• Opening sound of an MGM film
• Crowd noise?
• Big engine sound
• Make like a lion
• Din from a den
• Leo's sound
• Emulate MGM's lion
• Sound of the ocean or a lion
• Audience's sound