Crossword Genius

Note that starts off the dawn chorus (3)

Ross

I believe the answer is:

sol

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'note' is the definition.
(I know that sol is a type of note)

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

Can you help me to learn more?

(Other definitions for sol that I've seen before include "The sun in Spain" , "Note; Peruvian currency" , "nearby star" , "Fifth note of scale" , "Spanish and poetic sun" .)

I've seen this clue in the Evening Standard.
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