Crossword Genius

All dead in tree? (5)

Ross

I believe the answer is:

olive

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'tree?' is the definition.
(olive is a kind of tree)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for olive that I've seen before include "Source of edible oil" , "Type of green" , "Oil-producing fruit" , "Evergreen Mediterranean tree" , "Tree - shade of green" .)

I've seen this clue in The Sun.
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