Adjusts what cockney repairman does? (6)

I believe the answer is:

emends

'adjusts' is the definition.
(to emend is to adjust or tweak)

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

(Other definitions for emends that I've seen before include "'Corrects, puts right (6)'" , "Revises" , "Alters, corrects" , "Improves,corrects" , "Alters written material to remove errors" .)

I've seen this clue in The Guardian.

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