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All answers having "Diner order" as clue:

3 Character Answers:

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BLT



4 Character Answers:

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HASH

JAVA

TOGO



5 Character Answers:

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DECAF

USUAL



6 Character Answers:

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OMELET



7 Character Answers:

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ALAMODE



8 Character Answers:

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TUNAFISH

TUNAMELT



11 Character Answers:

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HOLDTHEMAYO



12 Character Answers:

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CLUBSANDWICH



15 Character Answers:

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APPLEPIEALAMODE

SPANISHOMELETTE

TWOEGGSOVEREASY

WESTERNOMELETTE