Overly smooth-talking (4)

I believe the answer is:

oily

'overly smooth-talking' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for oily that I've seen before include "Smooth; like lubricant" , "Unctuous" , "Smooth, ingratiating" , "Unpleasantly ingratiating" , "Viscous" .)

I've seen this clue in the Newsday and the Newsday.com.

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