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All answers having "Singular" as clue:

3 Character Answers:

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ODD

ONE



4 Character Answers:

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LONE

ONLY

RARA

RARE

SOLE

UNAL



5 Character Answers:

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OUTRE

QUEER

WEIRD



6 Character Answers:

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UNIQUE



7 Character Answers:

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SPECIAL

STRANGE

UNUSUAL



8 Character Answers:

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SOLITARY



9 Character Answers:

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UNEQUALED



10 Character Answers:

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REMARKABLE