Stingless bee
I believe the answer is:
drone
'stingless bee' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for drone that I've seen before include "RPV" , "Remote controlled aircraft" , "Male bee - monotonous hum" , "Sustained bass note accompanying a melody - male bee" , "Monotonous low sound" .)