Facile government politician (4)
I believe the answer is:
glib
'facile' is the definition.
(thesaurus)
'government politician' is the wordplay.
'government' becomes 'g'.
'politician' becomes 'lib' (**).
'g'+'lib'='GLIB'
(Other definitions for glib that I've seen before include "Bush" , "Fluent but evasive" , "freedom of speech?" , "Of speech, facile but insincere" , "Having only superficial plausibility" .)