Crossword Genius

Goes on in monotone (6)

Ross

I believe the answer is:

drones

(Other definitions for drones that I've seen before include "Male bees or idlers" , "Aircraft operated by remote control" , "Stingless male bees" , "Honeybees that mate with the queen" , "Male honey bees" .)

I've seen this clue in the Universal.
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