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All answers having "End of the definition" as clue:

5 Character Answers:

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SANTA



7 Character Answers:

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ITATALL

THOUGHT



8 Character Answers:

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HISBONES



9 Character Answers:

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AFTERTHEM

OURSELVES



10 Character Answers:

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BYMARRIAGE



11 Character Answers:

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FROMCOLLEGE

OUTTHEOTHER

THEOTHERONE



12 Character Answers:

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BUSINESSSUIT

CANNOTRESIST

CONVERSATION

CURLUPANDDYE

THEEMPTYNEST



13 Character Answers:

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AMOVIETHEATER



14 Character Answers:

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BECOMEOBSOLETE



15 Character Answers:

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ANDCALLITABRIEF

BEFOREYOUNEEDIT

EARSTOTHEGROUND

FAMOUSFDRQUOTES

GIVEOURMISTAKES

HAPPENINGATONCE

RARENORWELLDONE

UPWITHYESTERDAY

WHEREYOUHEARDIT



21 Character Answers:

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SOMEFRESHGROUNDPEPPER