Complete and utter European (6)
I believe the answer is:
finish
'complete' is the definition.
(synonyms)
'utter european' is the wordplay.
'utter' shows a homophone (sound like) (I've seen 'uttered' mean this).
'european' becomes 'Finnish'.
'finnish' sounds like 'FINISH'.
'and' is the link.
(Other definitions for finish that I've seen before include "Come to an end" , "Bring to an close" , "Pefect" , "Cease, conclude" , "Conclude, end" .)