Dickens sold in Wick without front covers (3,4)
I believe the answer is:
old nick
'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" .)