Crossword Genius

Cancel social gathering of many nations' representatives? (4)

Ross

I believe the answer is:

undo

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'cancel' is the definition.
(thesaurus)

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(Other definitions for undo that I've seen before include "(4)" , "Open, a knot say" , "Unravel or ruin" , "Dissolve - ruin" , "Subvert" .)

I've seen this clue in The Telegraph.
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