Crossword Genius

Peg must catch right plane, for example (4)

Ross

I believe the answer is:

tree

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This might be a double definition.

'peg must catch right' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'plane for example' is the second definition.
(plane is a type of tree)

Can you help me to learn more?

(Other definitions for tree that I've seen before include "Eg, alder" , "Elder, possibly" , "May" , "Box, perhaps" , "trod the boards" .)

I've seen this clue in The Times.
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