Crossword Genius

Score one more for what was the majority (6-3)

Ross

I believe the answer is:

twenty-one

I'm a little stuck... Click here to teach me more about this clue!

'what was the majority' is the definition.
I can't tell whether this defines the answer.

'score one more' is the wordplay.
'score' becomes 'twenty' (synonyms).
'more' says to put letters next to each other (some letters added to the previous ones).
'twenty'+'one'='TWENTY-ONE'

'for' acts as a link.

Can you help me to learn more?

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

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