Style of jazz, Auntie heard on gramophone, essentially (5)

I believe the answer is:

bebop

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'style of jazz' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for bebop that I've seen before include "1940s' jazz characterised by virtuosity" , "Variety of jazz from the 1940s" , "kind of jazz" , "Syncopated 1940s' jazz" , "Jazz genre" .)

I've seen this clue in The Independent.

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