The most common and most likely answer to this crossword clue is the 6 letter word BEHAVE
I've seen this crossword clue in The Times
B
E
H
A
V
E
More clues leading to the result BEHAVE
- Two auxiliaries to act correctly
- Live on own, and conduct oneself properly
- Auxiliary verbs act correctly
- Two auxiliaries to maintain decorum
- Live on own and stay out of trouble
- Imperatives of existence and ownership make us act well
- Pair of auxiliaries act correctly
- Auxiliary verbs function properly
- Conduct oneself in original duets from Beethoven, Handel, and Verdi
- Experience after live act
Buddy explains!

The straight part
We know that "cause no trouble" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cause no trouble = behave.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 BEHAVE mean?
BEHAVE verb- To conduct (oneself) well, or in a given way.
- To act, conduct oneself in a specific manner; used with an adverbial of manner.
- To conduct, manage, regulate (something).
- To act in a polite or proper way.