The language could be French (6)
I believe the answer is:
polish
'the language' is the definition.
(Polish is a language)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for polish that I've seen before include "Language (linked to spitting?)" , "Brush up" , "Rub until shiny" , "Gloss - refinement" , "Perfect" .)