Proverbially busy flyers (4)

I believe the answer is:

bees

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

This is the entire clue.

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(Other definitions for bees that I've seen before include "Social workers?" , "spelling contests" , "Honey makers" , "They are kept in an apiary" , "Hairy-bodied insects" .)

I've seen this clue in The Mirror.

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