Chance setter had to cut stress (8)
I believe the answer is:
accident
'chance' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for accident that I've seen before include "Eg, car crash" , "Pile-up" , "Dance tic leading to mishap" , "Chance event with no apparent cause" , "Unexpected incident" .)