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All answers having "Phantom" as clue:

5 Character Answers:

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ADMIT

GHOST

OUTER

SHADE

SHAPE

SPOOK



6 Character Answers:

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SHADOW

SPIRIT

VISION

WRAITH



7 Character Answers:

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EIDOLON

SPECTER

SPECTRE



8 Character Answers:

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SPECTRAL



9 Character Answers:

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IMAGINARY