Swerving fast round a left-handed bend, makes mistakes! (6)

I believe the answer is:

faults

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'mistakes' is the definition.
(I know this)

I don't understand how the remainder of the clue works.

(Other definitions for faults that I've seen before include "Flaws - defects" , "'Flaws, imperfections (6)'" , "Weakness or failings" , "Flaws or failings" , "Defects and failings" .)

I've seen this clue in the Evening Standard.

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