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All answers having "Cool ___" as clue:

3 Character Answers:

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CAT

DEF

FAB

FAN

HEP

HIP

ICE

ITS

NOT

RAD

RHO

TOO

WAY



4 Character Answers:

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CALM

DOPE

ICED

NEAT

NICE



5 Character Answers:

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ALOOF

CHILL

NEATO

POISE

SWEET



6 Character Answers:

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APLOMB

CHILLY

GROOVY

SERENE



10 Character Answers:

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NONCHALANT



11 Character Answers:

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ASACUCUMBER



13 Character Answers:

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DISPASSIONATE

SELFPOSSESSED