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Live hornet buzzing around First Class (2,3,3)

Ross

I believe the answer is:

on the air

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'live' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for on the air that I've seen before include "radio listeners can now hear?" , "Anti-hero engaged in live broadcast" , "In the process of broadcasting, radio or TV" , "Broadcasting (hence audible)" .)

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