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

I believe the answer is:

avocado

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

'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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.