Crossword Genius

Composed a serenade with notes missing (6)

Ross

I believe the answer is:

serene

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

I can't explain the remainder of the clue.

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(Other definitions for serene that I've seen before include "Calm and unruffled, like a princely title." , "Placid" , "Peaceful and contented" , "Totally unagitated" , "Peaceful and unruffled" .)

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