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All answers having "Lunch" as clue:

3 Character Answers:

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EAT



4 Character Answers:

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MEAL

TRAY



5 Character Answers:

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OUTTO

POWER



6 Character Answers:

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REPAST

TIFFIN



8 Character Answers:

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NOONMEAL



10 Character Answers:

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BROWNBAGIT



15 Character Answers:

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SOUPANDSANDWICH