Fool found climbing a tree? (3)
I believe the answer is:
sap
'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" .)