The —, 1797 novel by Mrs Ann Radcliffe subtitled The Confessional of the Black Penitents (7)
I believe the answer is:
italian
(Other definitions for italian that I've seen before include "Mediterranean language" , "Relating to a Neapolitan, say" , "Like maestro or diva" , "In a tail (anag)" , "A film was made about such a job" .)