The most common and most likely answer to this crossword clue is the 8 letter word INCIDENT
I've seen this crossword clue in Financial Times
I
N
C
I
D
E
N
T
More clues leading to the result INCIDENT
- Occurrence in part of hospital involving police
- Event in Met and NHS departments
- Violent event? As one of the detectives, gets dispatched first off
- Event curtailed tennis game, with police brought in
- Innocent number released, having secured identity in disturbance?
- Place for a plain-clothes detective: hospital department event
- Something that happened in hospital department – police getting involved
- Event is liable to occur
- Order to conceal Channel Islands’ public disturbance
- Depression following popular Channel Islands event
Buddy explains!

The straight part
We know that "Violent event" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case violent event = incident.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 INCIDENT mean?
INCIDENT noun- An event or occurrence.
- A (relatively minor) event that is incidental to, or related to others.
- An event that causes or may cause an interruption or a crisis, such as a workplace illness or a software error.
- Arising as the result of an event, inherent.
- (of a stream of particles or radiation) Falling on or striking a surface.
- Coming or happening accidentally; not in the usual course of things; not in connection with the main design; not according to expectation; casual; fortuitous.
- Liable to happen; apt to occur; befalling; hence, naturally happening or appertaining.
- Dependent upon, or appertaining to, another thing, called the principal.