& 2D The —, 1933 novel by Dennis Wheatley (9,9) (9)

I believe the answer is:

forbidden

(Other definitions for forbidden that I've seen before include "Prohibited, taboo" , "This fruit is always more enticing" , "Proscribed" , "Illicit pleasure" , "Verboten, prohibited" .)

I've seen this clue in The Mirror.

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