In effect, a riot in Ulster (6)

I believe the answer is:

result

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'in effect' is the definition.
'result' can be an answer for 'effect' (I have seen 'Effect of lustre ' mean 'result' so perhaps 'effect' could also mean 'result'). I'm not certain of the 'in' bit.

'a riot in ulster' is the wordplay.
'ulster' can be anagrammed to 'RESULT'.
Though, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for result that I've seen before include "'Outcome, consequence (6)'" , "Rustle (anag.)" , "'Outcome, upshot (6)'" , "Verdict" , "End - issue" .)

I've seen this clue in the Evening Standard.

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