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Crash badly, sustaining extremely traumatic wound (7)

Ross

I believe the answer is:

scratch

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'wound' is the definition.
(scratch is a kind of wound)

I don't 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 "claw" , "Slight cut" , "Score, mark; cancel" , "Withdraw - abrasion" , "Insignificant injury" .)

I've seen this clue in The Hindu.
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