Polish European, by the sound of it? (6)
I believe the answer is:
finish
'polish' is the definition.
(thesaurus)
'european by the sound of it?' is the wordplay.
'european' becomes 'finnish'.
'by the sound of it?' shows a homophone (sound like).
'finnish' is a homophone of 'FINISH'.
(Other definitions for finish that I've seen before include "End or terminus" , "Conclude, end" , "surface texture" , "Treatment of surface" , "Put the final touches to" .)