Buff from Gdansk, possibly (6)
I believe the answer is:
polish
'buff' is the definition.
(I've seen this before)
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 "Smooth or shine by rubbing" , "Refine, language" , "'Buff, burnish (6)'" , "elegance" , "Language (linked to spitting?)" .)