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All answers having "Fleet" as clue:

3 Character Answers:

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STS



4 Character Answers:

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FAST

NAVY



5 Character Answers:

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AGILE

RAPID

SHIPS

SWIFT



6 Character Answers:

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ARGOSY

ARMADA

SPEEDY

STREET



8 Character Answers:

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WARSHIPS



15 Character Answers:

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GROUPOFWARSHIPS