Beginning as only a slight injury (7)

I believe the answer is:

scratch

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

I cannot understand how the rest of the clue works.

(Other definitions for scratch that I've seen before include "Score - postpone indefinitely" , "not much of a handicap" , "Handicap where expected to make" , "In golf, a handicap of zero strokes" , "Rough and ready" .)

I've seen this clue in the Evening Standard.

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