The outcome is to go to law (5)
I believe the answer is:
issue
'the outcome' is the definition.
(I've seen this before)
'is to go to law' is the wordplay.
'to go to law' becomes 'sue' (as in suing somebody in court).
'is'+'sue'='ISSUE'
(Other definitions for issue that I've seen before include "Instalment" , "litter" , "Publish, bring out" , "Result, outcome; topic" , "Produce" .)