Mend a broken marriage? (6)

I believe the answer is:

repair

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'mend' is the definition.
(I know that mend can be written as repair)

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

Can you help me to learn more?

(Other definitions for repair that I've seen before include "Withdraw" , "do some darning" , "resort" , "Go - fix" , "Restore (something) to good condition" .)

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

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