Crossword Genius

Brownie ingredient (6)

Ross

I believe the answer is:

walnut

'brownie ingredient' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for walnut that I've seen before include "Hard dark-brown wood used furniture" , "Popular wood for furniture" , "Tree yielding good wood for furniture" , "A hardwood" , "Valuable furniture wood" .)

I've seen this clue in the New York Times, the King Feature Syndicate, the Jonesin Crosswords and the Jonesin'.
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