Crossword Genius

Tree in river not cold at first (5)

Ross

I believe the answer is:

alder

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'tree' is the definition.
(I know that alder is a type of tree)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for alder that I've seen before include "Tree with toothed leaves and cone-like fruits" , "Tree akin to the birch" , "One [TYPE OF TREE]" , "Type of birch tree" , "Tree or shrub whose wood is resistant to underwater rot" .)

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