Accidentally undid a jig act in ruling on a dispute (12)

I believe the answer is:

adjudicating

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'ruling on a dispute' is the definition.
The answer and definition can be both to do with social activities as well as being present participle verbs.
Maybe they are linked in a way I don't understand?

'accidentally undid a jig act' is the wordplay.
'accidentally' indicates anagramming the letters (a chaotic or accidental ordering of the letters).
'undid'+'a'+'jig'+'act'='undidajigact'
'undidajigact' anagrammed gives 'ADJUDICATING'.

'in' acts as a link.

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I've seen this clue in the Sydney Morning Herald.

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