Related Clues:

• High-tech surveillance tool
• Plane without a pilot
• Spying aircraft
• Go (on) dully
• One tonne free, in a manner of speaking
• Hurdy-gurdy sound
• Surveillance tool
• Unmanned, unsettling military flier
• Talk and talk and ..
• Enunciate slowly
• Teacher, with age, defends right to be a bore
• Chant in an unvarying voice
• Idle fellow, but he gives us a buzz
• Talk boringly; a parasite
• Talk boringly; male bee