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All answers having "Snack" as clue:

3 Character Answers:

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BAR

EAT



4 Character Answers:

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BITE

FOOD

NOSH



5 Character Answers:

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ABITE



6 Character Answers:

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NGMACH

NIBBLE



9 Character Answers:

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SCOTCHEGG



12 Character Answers:

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CLUBSANDWICH



13 Character Answers:

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BACONSANDWICH