Crossword Genius

Cut needed in extra injury

Ross

I believe the answer is:

black eye

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'injury' is the definition.
(black eye is a kind of injury)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for black eye that I've seen before include "Kind of bruise - kind of bean" , "Outcome of strike" , "Facial bruising" , "Result of blow to optic" , "Shiner" .)

I've seen this clue in The Telegraph.
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