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All answers having "Riot" as clue:

4 Character Answers:

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CARD

HOOT

HOWL

TRIO

TRIP



5 Character Answers:

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CUTUP

MELEE

REBEL

SCENE



6 Character Answers:

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GASSER

SCREAM

STITCH

TUMULT

UPROAR



7 Character Answers:

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RAMPAGE



10 Character Answers:

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SHOOTCRAPS