Crossword Genius

Defeated, Jason backs a couple (4)

Ross

I believe the answer is:

dyad

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'a couple' is the definition.
(something made up of two parts)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dyad that I've seen before include "Couple" , "is in element" , "Something in two parts" , "Pair" .)

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