Risk — peril (6)
I believe the answer is:
danger
I believe this clue is a double definition.
'risk' is the first definition.
(I know that risk can be written as danger)
'peril' is the second definition.
(I know that peril can be written as danger)
(Other definitions for danger that I've seen before include "Red flag, for example" , "Peril in garde" , "'Peril, risk (6)'" , "Peril, jeopardy" , "Undesirable possibility" .)