Swerving fast round a left-handed bend, makes mistakes! (6)
I believe the answer is:
'mistakes' is the definition.
(I know this)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for faults that I've seen before include "Flaws - defects" , "'Flaws, imperfections (6)'" , "Weakness or failings" , "Flaws or failings" , "Defects and failings" .)