Crossword Genius

How one driver in turning makes mistakes? (6,2)

Ross

I believe the answer is:

screws up

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'makes mistakes?' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their -s form.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

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I've seen this clue in The Globe and Mail.
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