Crossword Genius

Fool found climbing a tree? (3)

Ross

I believe the answer is:

sap

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'fool' is the definition.
(I know that fool can be written as sap)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sap that I've seen before include "Enfeeble" , "Cosh; plant's juice" , "Drain - vital fluid" , "Plant's fluid" , "The juice in trees" .)

I've seen this clue in The Globe and Mail.
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