Crossword Genius

Twenty known by those in the know? (5)

Ross

I believe the answer is:

score

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'twenty' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for score that I've seen before include "Shoot a goal for a twenty" , "Cut - and run!" , "Notch; twenty" , "Grade; twenty" , "Reckoning" .)

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