Unpleasantly and excessively suave or ingratiating (8)

I believe the answer is:

unctuous

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

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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