By-product of Ulster Question? (6)

I believe the answer is:

result

I'm a little stuck... Click here to teach me more about this clue!

'by-product' is the definition.
(thesaurus)

'ulster question?' is the wordplay.
'ulster' anagrams to 'RESULT'.
However, I'm not clear how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for result that I've seen before include "Effect - outcome" , "Verdict" , "Final outcome" , "Rustle (anag.)" , "'Outcome, consequence (6)'" .)

I've seen this clue in the Irish Times.

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