Crossword Genius

Clean tongue (6)

Ross

I believe the answer is:

polish

I believe this clue is a double definition.

'clean' is the first definition.
(thesaurus)

'tongue' is the second definition.
(Polish is an example of a language)

(Other definitions for polish that I've seen before include "'Buff, burnish (6)'" , "class" , "See 1" , "European - gloss" , "elegance" .)

I've seen this clue in The Independent.
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