The most common and most likely answer to this crossword clue is the 7 letter word RAMPING
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "behaving violently" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case behaving violently = ramping.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 RAMPING mean?
RAMPING verb- To behave violently; to rage.
- To spring; to leap; to bound, rear, or prance; to move swiftly or violently.
- To climb, like a plant; to creep up.
- To stand in a rampant position.
- To (cause to) change value, often at a steady rate.
- To adapt a piece of iron to the woodwork of a gate.
- A steady change in value.
- Violent behaviour; raging.