Crossword Genius

Scar that reveals Satan? (3,4)

Ross

I believe the answer is:

old nick

'satan?' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for old nick that I've seen before include "Satan" , "alternative to deep blue sea" , "The devil, Lucifer" , "Mephisto" , "spirit of evil" .)

I've seen this clue in The Independent.
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