The most common and most likely answer to this crossword clue is the 8 letter word VOLLEYED
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Buddy explains!

The straight part
We know that "Fired every gun/shot on court" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fired every gun/shot on court = volleyed.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 VOLLEYED mean?
VOLLEYED verb- To fire a volley of shots
- To hit the ball before it touches the ground
- To be fired in a volley
- To make a volley
- To sound together