Crossword Genius

Hearing judged useless after one's passed wind (7)

Ross

I believe the answer is:

mistral

I'm a little stuck... Click here to teach me more about this clue!

'wind' is the definition.
(I know that mistral is a type of boreas)

'hearing judged useless after one's passed' is the wordplay.
I cannot really understand how this works, but
'one's' could be 'is' (Roman numeral) and 'is' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for mistral that I've seen before include "Violent northeast wind of southern France" , "Strong north wind of southern France" , "French wind" , "Strong wind down the 20 valley" , "That's a blow" .)

I've seen this clue in The Times.
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