Crossword Genius

Mark is to withdraw from contest (7)

Ross

I believe the answer is:

scratch

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'mark' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for scratch that I've seen before include "small injury" , "Receiving no allowance < , ready" , "Mark with something sharp" , "Back out of race" , "Don't play" .)

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