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All answers having "Uncertain" as clue:

4 Character Answers:

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ASEA

HAZY

IFFY

TORN



5 Character Answers:

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ATSEA

CHANY

DICEY

LEERY

RISKY

ROCKY

VAGUE



6 Character Answers:

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CHANCY

CLOUDY

SMELLY

UNSURE



7 Character Answers:

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ATALOSS

DUBIOUS

HALTING

INDOUBT

NOTSURE

TENUOUS



8 Character Answers:

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DOUBTFUL

INSECURE



9 Character Answers:

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DOUBTABLE

TENTATIVE



10 Character Answers:

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INDEFINITE

PRECARIOUS

TOUCHANDGO

UPINTHEAIR



13 Character Answers:

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INDETERMINATE