Related Clues:

• Pilotless aircraft
• Rec room activity
• Cat sound
• Bullet sound
• Sound of engine trouble
• Sound from a fan
• Use kazoos
• "Turandot" role
• Drone
• Kitten's comment
• Spinning sound
• Be a poor public speaker
• Contented murmur
• Be at a loss for words?
• Render a tune