Crossword Genius

Timber going up river (3)

Ross

I believe the answer is:

yew

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This clue might be a double definition.

'timber' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'going up river' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for yew that I've seen before include "Evergreen tree with dark needles and red berries" , "'Evergreen tree, reddish-brown wood (3)'" , "Evergreen shrub" , "Tree associated with graveyards" , "Wood for bows" .)

I've seen this clue in the Evening Standard.
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