Revolutionary stunt performed behind animal in tree (5,8)
I believe the answer is:
horse chestnut
'revolutionary stunt performed' is the definition.
I can't tell whether this defines the answer.
'behind animal in tree' is the wordplay.
'behind' is a charade indicator (letters next to each other).
'animal' becomes 'horse' (type of animal).
'in tree' becomes 'chestnut' (chestnut is a kind of tree. I am not sure about the 'in' bit.).
'horse' put next to 'chestnut' is 'HORSE-CHESTNUT'.
Can you help me to learn more?
(Other definitions for horse chestnut that I've seen before include "Tree with sticky buds" , "It bears fruit" , "whose shade may be seen in park" , "Plant" , "seen in the woods" .)