The language of the finishing school? (6)
I believe the answer is:
polish
'the language' is the definition.
(Polish is an example)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for polish that I've seen before include "Beeswax, for example" , "tongue" , "Shine up the nationality" , "taught in finishing school?" , "See 1" .)