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One found in a tree in Mexico, stoned (7)

Ross

I believe the answer is:

avocado

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'one' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for avocado that I've seen before include "Ingredient of guacamole" , "one's stoned?" , "Blackish- or yellowish-green colour" , "Green - fruit eaten as a vegetable" , "Shade of green" .)

I've seen this clue in The Independent.
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