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