The most common and most likely answer to this crossword clue is the 6 letter word KARATE
I've seen this crossword clue in The Daily Telegraph
K
A
R
A
T
E
More clues leading to the result KARATE
- Woman adopting a king’s method of self-defence
- Artist seized by girl in combat
- A price on back of pack for a sort of chop
- Catherine shackles artist in sport
- Duchess eats a first rate sort of chop
- Katharine interrupted by a king in choppy exchange?
- Source of kerfuffle, a judge in choppy exchange?
- Shrew in need of taming interrupted by a king in unarmed combat
- Take ground with artilleryman entering unarmed combat
- Art of defence seen in answer given by king in front of judge
Buddy explains!

The straight part
We know that "choppy exchange?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case choppy exchange? = karate.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.
What does KARATE mean?
KARATE noun- An Okinawan martial art involving primarily punching and kicking, but additionally, advanced throws, arm bars, grappling and all means of fighting.
- To attack (somebody or something) with karate or similar techniques.