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All answers having "Positive" as clue:

3 Character Answers:

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OUI

PIE

PRO



4 Character Answers:

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FLAT

PLUS

ROSY

SURE

YEAH



5 Character Answers:

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CANDO

CLEAR

PRINT

PROOF



6 Character Answers:

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SUREOF

UPBEAT



7 Character Answers:

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CERTAIN

YOUSURE



8 Character Answers:

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DEFINITE

SUREFIRE



9 Character Answers:

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ABOVEZERO

ASSERTIVE



11 Character Answers:

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AFFIRMATIVE