Crossword Genius

Isn't giving them first two original promissory notes, which is disreputable (9)

Ross

I believe the answer is:

notorious

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'is disreputable' is the definition.
(similar in meaning)

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

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(Other definitions for notorious that I've seen before include "Undesirably well-known" , "of ill-repute" , "Famous for bad deeds" , "Disgraceful" , "Scandalous" .)

I've seen this clue in The Irish Times.
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