Crossword Genius

A stretcher to boot (4)

Ross

I believe the answer is:

tree

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'a stretcher' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'boot' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for tree that I've seen before include "Large shrub; family line" , "Eg, laburnum" , "Elm, perhaps" , "Oak, for example" , "Hazel for instance" .)

I've seen this clue in The Globe and Mail.
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