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All answers having "Unique" as clue:

4 Character Answers:

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LONE

ONLY

RARA

RARE

SOLE



5 Character Answers:

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ALONE

NOVEL



6 Character Answers:

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ONEOFF



7 Character Answers:

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ONETIME

SPECIAL



8 Character Answers:

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PEERLESS

SINGULAR



9 Character Answers:

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MATCHLESS



10 Character Answers:

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INIMITABLE

ONEANDONLY

ONEOFAKIND

SUIGENERIS



12 Character Answers:

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UNPARALLELED



13 Character Answers:

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INASSBYITSELF

IRREPLACEABLE



15 Character Answers:

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UNLIKEANYOTHERS