The most common and most likely answer to this crossword clue is the 8 letter word ENDANGER
I've seen this crossword clue in The Times
E
N
D
A
N
G
E
R
More clues leading to the result ENDANGER
- Risk complete outrage
- Put at risk, cease to be annoyed?
- Threaten to close, wind up
- Object, with annoyance, to risk
- Threaten corrupt grandee? Not at first
- Close by mountains, moving river is risk
- Put at risk, destroy bug
- Risk passion, following break-up
- Put in peril? No good being cross any more!
- Stop bad feeling, reaching compromise
Buddy explains!

The straight part
We know that "Risk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case risk = endanger.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 ENDANGER mean?
ENDANGER verb- To put (someone or something) in danger; to risk causing harm to.
- To incur the hazard of; to risk; to run the risk of.