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Satan's scar? (3,4)

Ross

I believe the answer is:

old nick

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This might be a double definition.

'satan's' is the first definition.
(synonyms)

'scar?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for old nick that I've seen before include "Newgate's" , "Newgate or Marshalsea?" , "The Evil One" , "spirit of evil" , "Mephisto" .)

I've seen this clue in The Sun.
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