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All answers having "Signs" as clue:

3 Character Answers:

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ATS

RHO

XES



4 Character Answers:

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INKS

NEON

PENS



5 Character Answers:

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NEONS

OMENS

VITAL



6 Character Answers:

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ENACTS

TOKENS

TRACES



7 Character Answers:

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INDICIA

POSTERS



8 Character Answers:

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EARMARKS

ENDORSES

PLACARDS

PORTENTS

SYMPTOMS



10 Character Answers:

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ENTERSINTO