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All answers having "Underwater missile" as clue:

4 Character Answers:

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HERE

IRIS

TURN



5 Character Answers:

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NEIGH

SCARE

VIRGO



7 Character Answers:

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LORRIES

POLARIS

REDRESS

SPINOFF

TORPEDO



8 Character Answers:

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PEDIGREE



11 Character Answers:

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FISHTORPEDO