Acorns, perhaps, out of one's tree (4)

I believe the answer is:

nuts

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

'acorns' is the definition.
The definition and answer can be both plants as well as being plural nouns.
Maybe you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nuts that I've seen before include "Mad - hard fruits" , "Is butter" , "Hard shells with edible kernels" , "Fruit - bananas!" , "Hard-shelled fruits or seeds" .)

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.