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All answers having "Apparition" as clue:

4 Character Answers:

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OBOE



5 Character Answers:

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BOGIE

GHOST

IMAGE

SHADE

SHAPE

SPOOK



6 Character Answers:

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SPIRIT

VISION

WRAITH



7 Character Answers:

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EIDOLON

PHANTOM

SPECTER

SPECTRE



8 Character Answers:

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PHANTASM

SUITCASE



9 Character Answers:

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LEVITICUS

PHANTASMA