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All answers having "Disappeared" as clue:

4 Character Answers:

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DIED

FLED

GONE

SANK

WENT

WORE



5 Character Answers:

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FADED



7 Character Answers:

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DIEDOUT

WORNOFF



8 Character Answers:

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VANISHED



10 Character Answers:

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GROUNDWENT



11 Character Answers:

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TOOKAPOWDER



15 Character Answers:

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TURNEDUPMISSING