Answer:

DRONE

Answer	Crossword Clue
DRONE	Run on
DRONE	Speak in a monotone
DRONE	Humming noise

DRONE	Talk on and on
DRONE	Monotonous hum
DRONE	Apiary member
DRONE	Queen bee's subject?
DRONE	Bagpipe noise
DRONE	Remote-control craft
DRONE	Hive-frequency sound?
DRONE	Monotonous noise

DRONE	Plane with no pilot
DRONE	Sing sans melody
DRONE	Play monotonously
DRONE	Pilotless plane
DRONE	Stingless bee
DRONE	UAV
DRONE	Unmanned plane
DRONE	Unpiloted plane

DRONE	Bagpipe sound
DRONE	Hum
DRONE	White noise
DRONE	Male bee
DRONE	Buzz
DRONE	Speak without variation
DRONE	Male in the hive
DRONE	Monotonous speaker

DRONE	Mindless worker
DRONE	Monotonous sound
DRONE	Queen's mate
DRONE	He bee
DRONE	Hive member
DRONE	Go (on, and on, and on...)
DRONE	Bagpipe production
DRONE	Go on and on and on ...

DRONE	Hive occupant
DRONE	Creature that won't sting
DRONE	Hive member or the sound it makes
DRONE	Low-level worker
DRONE	Unmanned aircraft