The , 1900 novel by Mary Elizabeth Braddon (7)

I believe the answer is:

infidel

(Other definitions for infidel that I've seen before include "Person who has no faith, or the wrong one" , "Person who does not believe in a religion" , "Person not operating in good faith" , "Unbeliever" , "Person rejecting a specific religion" .)

I've seen this clue in The Mirror.

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