Fix the outcome of (3)
I believe the answer is:
rig
'fix the outcome of' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rig that I've seen before include "Outfit; fix" , "Set up; equipment" , "set-up" , "Provide with clothes - for oil well?" , "Large American lorry" .)