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All answers having "Shelters" as clue:

4 Character Answers:

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ARKS

DENS

LEES



5 Character Answers:

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ABRIS

ASYLA

COTES

COVES

HIDES

NESTS

TENTS



6 Character Answers:

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HAVENS



7 Character Answers:

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DEFENDS

HARBORS

LEANTOS

RAMADAS



8 Character Answers:

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PROTECTS

RETREATS