Crossword Genius

Dickens sold in Wick without front covers (3,4)

Ross

I believe the answer is:

old nick

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'dickens' is the definition.
(both can informally mean the Devil)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for old nick that I've seen before include "Newgate's" , "The Dickens" , "The devil, Lucifer" , "Mephisto" , "Scratch" .)

I've seen this clue in The Times.
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