Tree juices (4)
I believe the answer is:
saps
'tree juices' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for saps that I've seen before include "Enervates in spas" , "More than one fool" , "Vital juices" , "Depletes the the strength of fools" , "Pass around foolish people" .)