Crossword Genius

Tree that gets shot in army base (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 don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for alder that I've seen before include "Tree related to the birch" , "North temperate tree with cone-like fruit" , "Artificial fishing fly" , "Water resistant wood" , "Tree with toothed leaves and cone-like fruits" .)

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