Crossword Genius

What a twister is and what it does (4)

Ross

I believe the answer is:

wind

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'it does' is the definition.
The definition suggests a singular noun which matches the answer.

I cannot understand how the rest of the clue works.

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(Other definitions for wind that I've seen before include "Twist or turn (in course)" , "Air current; twist" , "Meander, breeze" , "trade, for example" , "Twist, turn; breeze" .)

I've seen this clue in The Independent.
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