Crossword Genius

Score individual number (6-3)

Ross

I believe the answer is:

twenty-one

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But I can't explain it at all! Could you help me understand?

(Other definitions for twenty-one that I've seen before include "Card game, blackjack or pontoon" , "Target total in blackjack or pontoon" , "XXI - used to be the coming of age year" .)

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