Related Clues:
- Buzz Lightyear's back in hit, briefly
- Drone from hard right in corporation
- Continuous murmur
- Bees make it
- Drone in centre of Heathrow -- odd
- Good machine sound
- Busy place's buzz
- Whirring
- Sing with the mouth shut
- Rhythmic hum
- Generator's output
- Drone with loose filament
- Fire on all cylinders
- Guitar or engine sound
- Low drone