Crossword Genius

Fruit that you wouldn't expect to find in tree? (4)

Ross

I believe the answer is:

kiwi

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

'fruit' is the definition.
(I know that kiwi is a berry)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for kiwi that I've seen before include "'Fruit, bird and NZ rugby player (4)'" , "Hairy fruit with green flesh" , "Someone from New Zealand?" , "Sacred Japanese peak" , "Flightless NZ bird" .)

I've seen this clue in The Times.
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