"The Sweetest Taboo" singer, 1985 (4)
I believe the answer is:
sade
'the sweetest taboo singer 1985' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sade that I've seen before include "Jazz-pop group" , "The Marquis de . . . . was noted for cruelty" , "letter from Israel?" , "Hebrew character" , "The Marquis de .... was renowned for cruelty" .)