Confucian philosophy (3)
I believe the answer is:
'confucian philosophy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tao that I've seen before include "Chinese philosophical principle" , "Philosophical principle, the way" , "The way of Chinese philosophy" , "religious way" , "In China, code of behaviour in harmony with natural order" .)