A writer of music that calms? (8)

I believe the answer is:

composer

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'a writer of music' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for composer that I've seen before include "A sedative" , "Mozart, e.g." , "Arnold, perhaps" , "Eg, Arne, Bach, Chopin" , "eg Ravel" .)

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

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