Ulster is disturbed in consequence (6)
I believe the answer is:
result
'consequence' is the definition.
(I know that consequence can be written as result)
'ulster is disturbed' is the wordplay.
'is disturbed' indicates an anagram (the order of letters is disturbed).
'ulster' anagrammed gives 'RESULT'.
'in' acts as a link.
(Other definitions for result that I've seen before include "Final outcome" , "Effect - outcome" , "End - issue" , "Consequence or effect" , "Final score" .)