Chance or risk (6)
I believe the answer is:
hazard
I believe this is a double definition.
'chance' is the first definition.
(synonyms)
'risk' is the second definition.
(I know that hazard is a more specific form of risk)
(Other definitions for hazard that I've seen before include "Obstacle, source of danger" , "Obstruction feature on a golf course" , "Difficulty" , "Danger, risk - perhaps on golf course" , "Risk; guess" .)