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All answers having "Polaris" as clue:

4 Character Answers:

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ICBM

STAR



5 Character Answers:

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BERET

FSTAR



6 Character Answers:

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ETOILE

ROCKET

STELLA



7 Character Answers:

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MISSILE



8 Character Answers:

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LODESTAR

POLESTAR



9 Character Answers:

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NORTHSTAR