Crossword Genius

Prevent them from getting involved in dumb ruckus over there (4)

Ross

I believe the answer is:

curb

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'prevent' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for curb that I've seen before include "Restrain, inhibit" , "[LIMITATION]" , "Rein in" , "Bit - restraint" , "Restrain, perhaps your enthusiasm" .)

I've seen this clue in The Irish Times.
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