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All answers having "Sub" as clue:

4 Character Answers:

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BLIP

HERO

ROSA

TEMP



5 Character Answers:

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BELOW

POBOY

POENA

SITIN

UBOAT



6 Character Answers:

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FILLIN

HOAGIE



7 Character Answers:

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STANDIN

TEACHER



8 Character Answers:

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SANDWICH



9 Character Answers:

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ALTERNATE



12 Character Answers:

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HEROSANDWICH