Crossword Genius

Humphrey is making ordinary jazz style one to show off (8)

Ross

I believe the answer is:

braggart

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'off' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for braggart that I've seen before include "Show-off" , "Big boaster" , "Big noter" , "Vain boaster" , "bigmouth" .)

I've seen this clue in The Independent.
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