Drone (3)
'drone' is the definition.
(drone can mean to make a humming sound)
This is the entire clue.
(Other definitions for hum that I've seen before include "Drone - stink" , "Sing with the mouth shut" , "Smell strongly" , "Make musical sound with closed lips" , "Sound of busy activity" .)
'drone' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for idler that I've seen before include "Laggard" , "Layabout, loafer" , "One resting" , "Lazybones; gear wheel" , "Couch potato" .)