Come back to accept a solution for unresolved contest (5)

I believe the answer is:

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'come back' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for reply that I've seen before include "response is demanded" , "Answer, respond" , "Come back" , "Returned statement" , "Reciprocate" .)

I've seen this clue in The Guardian.

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