To create peace, jeopardises (9)
I believe the answer is:
endangers
'jeopardises' is the definition.
('endanger' can be a synonym of 'jeopardize')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for endangers that I've seen before include "Imperils" , "Risks" , "Places in peril" , "Puts in peril" , "Placed in peril" .)