The most common and most likely answer to this crossword clue is the 6 letter word ACTION
I've seen this crossword clue in The Times
A
C
T
I
O
N
More clues leading to the result ACTION
- Battle? Start shooting!
- Opening section of play maybe concerning battle
- A case for fighting
- Behaviour of clique ousting leader
- Fighting court case
- Rebellious group loses its first battle
- Order to begin shooting in battle
- Dissenting group dropping original lawsuit
- Fighting to get something done
- Order to start shooting in battle
Buddy explains!

The straight part
We know that "Fighting/court case" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fighting/court case = action.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 ACTION mean?
ACTION noun- Something done so as to accomplish a purpose.
- A way of motion or functioning.
- Fast-paced activity.
- A mechanism; a moving part or assembly.
- The mechanism, that is the set of moving mechanical parts, of a keyboard instrument, like a piano, which transfers the motion of the key to the sound-making device.
- The distance separating the strings and the fretboard on a guitar.
- Sexual intercourse.
- Combat.
- A charge or other process in a law court (also called lawsuit and actio).
- A mapping from a pairing of mathematical objects to one of them, respecting their individual structures. The pairing is typically a Cartesian product or a tensor product. The object that is not part of the output is said to act on the other object. In any given context, action is used as an abbreviation for a more fully named notion, like group action or left group action.
- The product of energy and time, especially the product of the Lagrangian and time.
- The event or connected series of events, either real or imaginary, forming the subject of a play, poem, or other composition; the unfolding of the drama of events.
- (painting and sculpture) The attitude or position of the several parts of the body as expressive of the sentiment or passion depicted.
- Spin put on the bowling ball.
- A share in the capital stock of a joint-stock company, or in the public funds.
- To act on a request etc, in order to put it into effect.
- To initiate a legal action against someone.
- Demanding or signifying the start of something, usually an act or scene of a theatric performance.