Possible Clues:

• European finesse
• Refinement of manners
• Language of ancient Greek community hard to follow
• Of one from Warsaw, say
• Refinement in one of classy speech, on the surface about fifty
• Beeswax, for example, from one of the EU countries
• Language that gives us 'kielbasa' and 'babka'
• Refinement of manners and language
• Elegance of a foreign language
• European gets a proper shiner in Japan!