Decline to have an accident? (4,3)
I believe the answer is:
fall off
'decline' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fall off that I've seen before include "How unsuccessful tightrope walker might" , "Deterioration" , "deteriorate" , "Decrease" , "Decline" .)