Smug (10)
'smug' is the definition.
(I've seen this before)
This is the entire clue.
(Another definition for complacent that I've seen is " Smug, uncritically self-satisfied".)
'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" .)