Crossword Genius

Withdraw from contest with a slight wound (7)

Ross

I believe the answer is:

scratch

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'slight wound' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scratch that I've seen before include "Slight wound; score" , "given no advantage" , "haphazard a team?" , "Receiving no allowance < , ready" , "not much of a handicap" .)

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