Smooth German politician (4)
I believe the answer is:
glib
'smooth' is the definition.
(I've seen this before)
'german politician' is the wordplay.
'german' becomes 'g' (abbreviation).
'politician' becomes 'lib' ().
'g'+'lib'='GLIB'
(Other definitions for glib that I've seen before include "slick in speech" , "Casually fluent" , "Silver-tongued" , "Insincerely fluent" , "Ready with insincere or superficial words" .)