Related Clues:

• Bee
• What fans do
• Buzz
• Sound of contentment
• Show pleasure
• Kittenish comment
• Sound like a well-tuned engine
• Stingless flier
• Siamese comment
• Sign of engine trouble
• ''I'm happy'' in Siamese?
• Hive member
• Remotely controlled craft
• Run smoothly
• ''Turandot'' role