Smug (4)

I think it could be either:

Which length description are you looking for?:

glib

'smug' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for glib that I've seen before include "Bush" , "Fluent but insincere" , "Having only superficial plausibility" , "Of speech, facile but insincere" , "Smooth-talking" .)

I've seen this clue in the Penny Press.

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