The most common and most likely answer to this crossword clue is the 4 plus 2 letter word KUNG FU
K
U
N
G
F
U
More clues leading to the result KUNG FU
- Martial art’s good fun struggling under a couple from Kuancheng
- Fine antelope in country turned up in Chinese art
- Britain upset farmers over government defence system
- Country backing force during tricky gun fighting method
- State backing leads to new guns for unconventional way of fighting
- Oriental art work ultimately attracting deep breath perhaps when removed from case
- Martial art king's gun is kaput — has endless fun
- King, peacekeepers and leaders of great fighting units formulated Wu Shu
- Martial art genius occasionally visiting this country, upset receiving fine
- Martial art created by partner interrupting a thousand peacekeepers for all to see
Buddy explains!

The straight part
We know that "Wu Shu" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wu shu = kung fu.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
Crossword Answer definitions
KUNG FU noun- A Chinese martial art.