An un-English suavity (6)
I believe the answer is:
polish
'suavity' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for polish that I've seen before include "Rub to a gloss" , "Smooth or shine by rubbing" , "European - gloss" , "Shine up the nationality" , "Rub - European" .)