Music emerging from upturned lead-coated gong (5)

I believe the answer is:

bebop

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'music' is the definition.
(bebop is a kind of music)

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

(Other definitions for bebop that I've seen before include "Form of modern jazz from about 1940" , "Variety of jazz from the 1940s" , "Jazz style of 40s" , "Jazzy music style" , "Fast, complex jazz" .)

I've seen this clue in the Sydney Morning Herald.

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