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All answers having "Marvelous" as clue:

3 Character Answers:

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FAB

OLE

RAD



5 Character Answers:

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GREAT

SUPER



6 Character Answers:

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DREAMY



7 Character Answers:

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HOWNICE



8 Character Answers:

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SPLENDID

TERRIFIC



10 Character Answers:

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OUTOFSIGHT

SUPERDUPER