Crossword Genius

Barrel material (3)

Ross

I believe the answer is:

oak

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">barrel material</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Wall Street Journal and The New York Times.
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