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All answers having "Festoon" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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SWAG

TRIM



5 Character Answers:

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ADORN

DITTO

DRAPE

TUTOR



6 Character Answers:

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BEDECK

COWPAT



7 Character Answers:

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DECKOUT

GARLAND



8 Character Answers:

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DECORATE