How to interrupt a composer! (6)

I believe the answer is:

chopin

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'composer' is the definition.
(Frederic Chopin, 1810-1849)

I can't explain the remainder of the clue.

(Other definitions for chopin that I've seen before include "Polish virtuoso composer" , "Great Polish composer of phonic kind" , "Frederic ......, 19th century Polish composer, mostly for piano" , "See 10" , "Polish composer of much piano music" .)

I've seen this clue in the Sydney Morning Herald.

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