Buff, burnish (6)
I believe the answer is:
polish
I believe this is a double definition.
'buff' is the first definition.
(I've seen this before)
'burnish' is the second definition.
(synonyms)
(Other definitions for polish that I've seen before include "Shine with cloth,buff" , "tongue" , "European language - refinement" , "See 1" , "'Buff, burnish (6)'" .)