What are the odds of brash remark showing disdain? (3)
I believe the answer is:
bah
'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.
Can you help me to learn more?
(Other definitions for bah that I've seen before include "Disbelieving expression" , "Appalling!" , "''... Humbug'' Scrooge's cry" , "Exclamation of disgust or annoyance" , "''...! Humbug!'' (Scrooge)" .)