Large altercation brewing — it's in the wind (4,8)

I believe the answer is:

alto clarinet

'it's in the wind' is the definition.
(instrument in the woodwind section)

'large altercation brewing' is the wordplay.
'large' becomes 'l'.
'brewing' indicates anagramming the letters.
'l'+'altercation'='laltercation'
'laltercation' anagrammed gives 'ALTO CLARINET'.

I've seen this clue in The Guardian.

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