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All answers having "Calm down!" as clue:

4 Character Answers:

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EASY



5 Character Answers:

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ABATE

CHILL

RELAX

TAKEA



6 Character Answers:

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COOLIT

NOWNOW

PACIFY

SEDATE

SETTLE

SOOTHE

SUBDUE



7 Character Answers:

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APPEASE

EASYNOW

PLACATE

QUIESCE



8 Character Answers:

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GETAGRIP



10 Character Answers:

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TAKEITEASY



12 Character Answers:

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DONTHAVEACOW



15 Character Answers:

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DONTHAVEAGASKET

KEEPYOURSHIRTON