Crossword Genius

Holiday notes for business (4)

Ross

I believe the answer is:

jazz

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This could be a double definition.

'holiday notes' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'business' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'for' acts as a link.

Can you help me to learn more?

(Other definitions for jazz that I've seen before include "Popular music from New Orleans" , "Music of African-American origin" , "Ronnie Scott's music?" , "Improvised, syncopated music" , "eg Trad" .)

I've seen this clue in The Guardian.
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