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All answers having "Smears" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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TARS



5 Character Answers:

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BLURS

DAUBS

PAGAN

SOILS



6 Character Answers:

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LIBELS



7 Character Answers:

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BEDAUBS

SMUDGES

STREAKS



8 Character Answers:

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SLANDERS