Supporter boycotted audacious Buddhist school (3)
I believe the answer is:
zen
'buddhist school' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for zen that I've seen before include "School of Buddhism" , "Form of Buddhism that says meditation brings enlightenment" , "Form of Buddhism that says enlightenment comes through meditation" , "Form of Buddhism, emphasises meditation" , "Dibdin detective; Jap. Buddhism" .)