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All answers having "Mirror" as clue:

3 Character Answers:

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APE



4 Character Answers:

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COPY

ECHO



5 Character Answers:

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GLASS

IMAGE

MIMIC



6 Character Answers:

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ENDEAR



7 Character Answers:

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IMITATE

REFLECT



8 Character Answers:

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RESEMBLE



9 Character Answers:

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REFLECTOR



10 Character Answers:

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VANITYFARE



12 Character Answers:

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LOOKINGGLASS