Language used by Chopin buff (6)

I believe the answer is:

polish

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This clue could be a double definition.

'language' is the first definition.
(Polish is a language)

'chopin buff' is the second definition.
'polish' can be an answer for 'buff' (I've seen this before). I'm unsure of the 'chopin' bit.

'used by' acts as a link.

Can you help me to learn more?

(Other definitions for polish that I've seen before include "Beeswax, for example" , "Substance used to produce shine" , "Shine for a European" , "Shine up in Warsaw" , "taught in finishing school?" .)

I've seen this clue in The Sunday Times and The Times.

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