Difference between scores? It's where notes go (6)

I believe the answer is:

margin

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'difference' is the definition.
(I know that margin is a type of disagreement)

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

Can you help me to learn more?

(Other definitions for margin that I've seen before include "Space at edge of page" , "Boundary line or the area" , "bank" , "Blank space around a text" , "Permissible difference" .)

I've seen this clue in The Times.

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