Crossword Genius

Lumber source (4)

Ross

I believe the answer is:

tree

'lumber source' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tree that I've seen before include "Genealogist's work" , "Be up a .... to be in difficulties" , "box, possibly" , "trod the boards" , "Beech, for example" .)

I've seen this clue in The Star Tribune.
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