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All answers having "Omen" as clue:

3 Character Answers:

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OWN



4 Character Answers:

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BODE

SIGN



5 Character Answers:

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BODER

NEVER



6 Character Answers:

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AUGURY

BODING



7 Character Answers:

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AUSPICE

PORTENT

PRESAGE



9 Character Answers:

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HARBINGER



10 Character Answers:

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FORERUNNER

PROGNOSTIC



11 Character Answers:

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SHAKESPEARE



15 Character Answers:

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ASTRAWINTHEWIND