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By the sound of it, language perfect (6)

Ross

I believe the answer is:

finish

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'perfect' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for finish that I've seen before include "Treatment of surface" , "Pefect" , "Patina" , "Conclude, wind up" , "Bring to an close" .)

I've seen this clue in The Times.
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