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All answers having "Layer" as clue:

3 Character Answers:

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HEN

PLY



4 Character Answers:

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COAT

LEAF

MIND

TIER



5 Character Answers:

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OZONE

SHEET

STORY

STRIA



6 Character Answers:

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LAMINA

MALICE

SOUGHT



7 Character Answers:

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GODDESS

RETREAD

STRATUM



8 Character Answers:

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STRATIFY