Crossword Genius

Repair rats (4)

Ross

I believe the answer is:

darn

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'repair' is the definition.
(darning is a kind of repairing)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for darn that I've seen before include "Repair (with needle)" , "Repair (sock)" , "curse" , "Repair with wool" , "Mend (woollens)" .)

I've seen this clue in the Sydney Morning Herald.
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