Crossword Genius

Mark defaced acting trophy (4)

Ross

I believe the answer is:

scar

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'mark' is the first definition.
(mark left by an injury)

'defaced acting trophy' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

Can you help me to learn more?

(Other definitions for scar that I've seen before include "Sign of wound" , "Permanently damage" , "Evidence of an old wound" , "Stigma" , "Gordale - - , Yorks" .)

I've seen this clue in the Sydney Morning Herald.
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