Chinese martial art (4,2)
I believe the answer is:
'chinese martial art' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kung fu that I've seen before include "fighting" , "Chinese type of karate" , "Unarmed Chinese martial art" , "Chinese system of unarmed combat like karate" , "Chinese form of unarmed combat, was a TV serial" .)