Crossword Genius

Mark is cross, twice (5)

Ross

I believe the answer is:

score

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'mark' is the definition.
(synonyms)

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(Other definitions for score that I've seen before include "Nick; twenty" , "musical work" , "Chalk up - twenty" , "Musical composition in written form" , "Tally; 20" .)

I've seen this clue in The Guardian.
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