Mark vocalised a Calypso sound (4)

I believe the answer is:

scar

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

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

(Other definitions for scar that I've seen before include "Visible mark of healing" , "Sign of wound" , "Bare craggy rock" , "Indication of damage" , "Mark from a wound left on the skin" .)

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

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