Crossword Genius

Part of some musical keys (5)

Ross

I believe the answer is:

ebony

(Other definitions for ebony that I've seen before include "Very dark black" , "'Hard, dark wood (5)'" , "Hard wood used for black piano keys and in cabinetwork" , "Dark hardwood" , "Black hardwood" .)

I've seen this clue in The New York Times.
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