Crossword Genius

Bridewell one that would do for Dickens? (3,4)

Ross

I believe the answer is:

old nick

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

I cannot understand how the remainder of the clue works.

(Other definitions for old nick that I've seen before include "The Evil One" , "Familiar name for the devil, ancient chap" , "'The prince of darkness (3,4)'" , "Fleet, for example" , "Alcatraz?" .)

I've seen this clue in The Times.
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