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All answers having "___ ghost" as clue:

4 Character Answers:

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SEEA



5 Character Answers:

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DRAWL

OMITS

SEESA

SHADE

SPOOK



6 Character Answers:

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SELDOM

SPIRIT

WRAITH



7 Character Answers:

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PHANTOM

SPECTER

SPECTRE

STORIES



8 Character Answers:

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PHANTASM

REVENANT

WATERLOO



10 Character Answers:

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APPARITION