Proverbially busy flyer (3)

I believe the answer is:

bee

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'proverbially busy flyer' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is all the clue.

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(Other definitions for bee that I've seen before include "competition" , "Buzzing insect" , "meeting" , "See 17" , "Honey-making insect" .)

I've seen this clue in The Mirror.

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