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All answers having "Planet" as clue:

3 Character Answers:

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DAY

DUE

HIP

MAR

NIT

ORB

RED

SHE

TEA

TOE



4 Character Answers:

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DEBT

EYES

FAIR

MARS

MAUL

NEST

SILK

SING

SORE

STAR

VERY



5 Character Answers:

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COUNT

DAILY

EARTH

ETHIC

EXERT

GLOBE

MANIA

PLEAT

PLUTO

STORE

TIGHT

VENUS

WORLD



6 Character Answers:

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AVERSE

CROPUP

DECAMP

KNOCKS

OSMIUM

REDEEM

SATURN

SIGHED

SPHERE

SUBURB

TELLER

URANUS

VERTEX



7 Character Answers:

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INTEGER

JUPITER

MAMMOTH

MERCURY

NEPTUNE

NETBALL

ORBITER

RECEIPT

SPECTRE

THERAPY

THINKUP



8 Character Answers:

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FLORENCE

SINISTER



9 Character Answers:

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LAZYSUSAN

TAKEAFTER



10 Character Answers:

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ABSTINENCE



12 Character Answers:

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CLOSEMOUTHED

FOSTERPARENT



13 Character Answers:

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SALTANDPEPPER