Crossword Genius

May be humming the note you hear (3)

Ross

I believe the answer is:

bee

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But I can't explain it at all! Could you help me understand?

(Other definitions for bee that I've seen before include "Social worker possibly" , "In one's bonnet, it's an obsessive idea" , "Buzzing insect" , "queen, perhaps" , "Busy buzzer" .)

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