Taoist's life force (3)
I believe the answer is:
chi
'taoist's life force' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for chi that I've seen before include "Mental projection" , "Classical symbol" , "Classical character" , "Letter written by European" , "In Chinese medicine, the life force inherent in all things" .)