The most common and most likely answer to this crossword clue is the 8 letter word PAROXYSM
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More clues leading to the result PAROXYSM
Buddy explains!

The straight part
We know that "Violent outburst" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case violent outburst = paroxysm.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 PAROXYSM mean?
PAROXYSM noun- A random or sudden outburst (of activity).
- An explosive event during a volcanic eruption.
- A sudden recurrence of a disease, such as a seizure or a coughing fit.