Related Clues:

• Show some love, so to speak
• Give it up, so to speak
• Loud, abrupt sound
• Abrupt bit of thunder
• Smack two palms
• Sound after a bolt
• Show support
• ... thunder
• Summon a servant, maybe
• Be a good fan
• Sound from Thor
• Try to induce an encore
• Reward the cast
• Indicate approval
• One way to request an encore