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All answers having "Settle down" as clue:

4 Character Answers:

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CALM

EASY

FALL

NEST



5 Character Answers:

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ABATE

RELAX

ROOST



6 Character Answers:

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ALIGHT

COOLIT



7 Character Answers:

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DESCEND

SUBSIDE



14 Character Answers:

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TAKEACHILLPILL

WAITJUSTONESEC



15 Character Answers:

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CALLOFFYOURDOGS

DONTHAVEACOWMAN

YOURACTTOGETHER