Ingratiating (6)

I believe the answer is:

smarmy

'ingratiating' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for smarmy that I've seen before include "Obsequious" , "Smooth" , "Bootlicking" , "Unpleasantly suave or ingratiating" , "Unctuous" .)

I've seen this clue in The Telegraph, the Newsday.com, the Wall Street Journal, The Guardian and The Times.

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