Obsequiously flattering, oily (8)

I believe the answer is:

unctuous

(Other definitions for unctuous that I've seen before include "Falsely ingratiating" , "Excessively ingratiating" , "Insincerely charming" , "Having an oily manner, smugly virtuous" , "Unpleasantly suave or ingratiating" .)

I've seen this clue in The Times.

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