Crossword Genius

Unctuous, glib, and that's flat! (6)

Ross

I believe the answer is:

smooth

I believe this clue is a triple definition!

'unctuous' is the first definition.
(thesaurus)

'glib' is the second definition.
(I've seen this in another clue)

'and' is a link.

'that's flat' is the third definition.
(thesaurus)

(Other definitions for smooth that I've seen before include "Free from roughness, bumps etc." , "Not rough or wrinkled" , "Unruffled" , "Calm" , "Flat - consistent - plausible" .)

I've seen this clue in the Evening Standard.
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