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All answers having "See 13 Down." as clue:

3 Character Answers:

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ATE

DAS

MAN



4 Character Answers:

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ALAS

ARAB

DECO

EVES

IBEX

INTO



5 Character Answers:

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ALLAH

BREAD

COHAN

KELLY

STORY

THING

VANCE

WOOLF



6 Character Answers:

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DONKEY

MYSELF



7 Character Answers:

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BAKEOFF

CEILING

PARKERS



8 Character Answers:

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TORICHES



9 Character Answers:

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BEHAVIOUR



13 Character Answers:

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ANDUPTHEOTHER



15 Character Answers:

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NOSTONEUNTURNED