Crossword Genius

Smarmily ingratiating (8)

Ross

I believe the answer is:

unctuous

(Other definitions for unctuous that I've seen before include "Unpleasantly suave or ingratiating" , "Insincerely charming" , "Excessively flattering" , "Greasy" , "Sycophantic - oily" .)

I've seen this clue in The Guardian.
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