Outcome of unsettled Ulster (6)
I believe the answer is:
result
'outcome' is the definition.
(synonyms)
'unsettled ulster' is the wordplay.
'unsettled' indicates an anagram.
'ulster' with letters rearranged gives 'RESULT'.
'of' is the link.
(Other definitions for result that I've seen before include "Consequence or effect" , "Effect - outcome" , "Outcome of an undertaking" , "Rustle (anag.)" , "Consequence in Ulster (6)" .)