One in the wind, singular events involving 3 staff? (9)

I believe the answer is:

mistrials

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'involving 3 staff?' is the definition.
I can't tell whether this definition defines the answer.

'one in the wind singular events' is the wordplay.
'one in the wind singular' becomes 'mis' (I can't justify this - if you can you should give a lot more credence to this answer).
'events' becomes 'trials' (trial is a kind of event).
'mis'+'trials'='MISTRIALS'

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