Crossword Genius

A minor disagreement (5)

Ross

I believe the answer is:

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This clue might be a double definition.

'a minor' is the first definition.
(thesaurus)

'disagreement' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for major that I've seen before include "Significant; rank" , "1 down's predecessor" , "Of great importance" , "grave" , "Of greater importance or stature" .)

I've seen this clue in the Evening Standard.
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