Crossword Genius

Heavy timber (5)

Ross

I believe the answer is:

ebony

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

I've seen this clue in The Wall Street Journal.
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