Claude —, French composer of 1902 opera Pelleas et Melisande (7)

I believe the answer is:

debussy

(Other definitions for debussy that I've seen before include "Claude -, Fr. composer" , "Claude, impressionist composer" , "Clair de Lune composer" , "Note-writer" , "Claude -, C. nineteen-twenty French composer" .)

I've seen this clue in The Mirror.

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