Match for two people (6)

I believe the answer is:

double

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'match' is the definition.
(double can mean a match or copy)

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

(Other definitions for double that I've seen before include "Twin, dual" , "Dartboard outer score" , "Twice - bent over - run" , "Ringer - large drink" , "What we may see" .)

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

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