Related Clues:

• Sound under the big top
• Horselaugh
• Sound after a walk-off home run
• Racecar sound
• Noise from fans
• Woman's sound?
• Summon a servant, maybe
• Be loud, as an engine
• Be a good fan
• Sound from Thor
• Copy a lion
• It's much more than chuckle
• Enthusiastic audience response
• Try to induce an encore
• Grandstand sound