Related Clues:

• Speak in a monotone
• Hum, e.g.
• Certain queen's subject
• Hive dweller
• Corporate flunky
• Annoying sound
• Male bee
• Military reconnaissance tool
• White noise
• Play a guitar idly
• Humming sound
• Play idly, as guitars
• Bagpipes noise
• Boring speaking voice
• Hum