Crossword Genius

What are the odds of brash remark showing disdain? (3)

Ross

I believe the answer is:

bah

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'what' is the definition.
Both the answer and definition are interjections.
Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for bah that I've seen before include "Disbelieving expression" , "Appalling!" , "''... Humbug'' Scrooge's cry" , "Exclamation of disgust or annoyance" , "''...! Humbug!'' (Scrooge)" .)

I've seen this clue in The Times.
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