Weapon creates danger as king falls down (4)
I believe the answer is:
kris
'weapon' is the definition.
(I know that kris is a type of dagger)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for kris that I've seen before include "weapon" , "Malay dagger, wavy blade" , "Its flag has a maple leaf" , "Indonesian dagger; sounds like fold" , "Malayan dagger" .)