Crossword Genius

Mark, the fellow with the muffler (4)

Ross

I believe the answer is:

scar

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'mark' is the definition.
(synonyms)

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

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(Other definitions for scar that I've seen before include "One left after having wound" , "Nasty mark" , "Remains of a wound" , "Steep cliff; skin mark" , "Mark left by the healing of injured tissue" .)

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