Crossword Genius

She sounds out difficult note for singer (5)

Ross

I believe the answer is:

heidi

'she' is the definition.

I can't explain the rest of the clue.

(Other definitions for heidi that I've seen before include "German lady's name" , "book" , "lady - from Cologne?" , "Girl's name (from German)" , "Novel Swiss girl" .)

I've seen this clue in The Guardian.
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