Crossword Genius

Barrel material (3)

Ross

I believe the answer is:

oak

'barrel material' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for oak that I've seen before include "Hardwood tree" , "Building timber" , "door at Oxford" , "Its seed is the acorn" , "Acorns are its fruit" .)

I've seen this clue in The New York Times and The Wall Street Journal.
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