Path to enlightenment
I believe the answer is:
tao
'path to enlightenment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tao that I've seen before include "Chinese way to be followed" , "Element of Chinese philosophy" , "Chinese philosophical principle" , "Confucian way to be followed" , "Philosophical principle, the way" .)