The most common and most likely answer to this crossword clue is the 5 letter word HEADY
I've seen this crossword clue in Independent
H
E
A
D
Y
Buddy explains!

The straight part
We know that "Violent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case violent = heady.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 HEADY mean?
HEADY adjective- Intoxicating or stupefying.
- Tending to upset the mind or senses.
- Exhilarating.
- Intellectual.
- Rash or impetuous.