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All answers having "Inactive" as clue:

3 Character Answers:

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RET

RHO



4 Character Answers:

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DEAD

IDLE



5 Character Answers:

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INERT

NOTON

ONICE



6 Character Answers:

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ASLEEP

ATEASE

ATREST

FALLOW

LATENT

OTIOSE

SILENT

STATIC

TEMPLE



7 Character Answers:

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DORMANT

PASSIVE

RESTING

RETIRED



8 Character Answers:

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DEEDLESS

STAGNANT



9 Character Answers:

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SEDENTARY



10 Character Answers:

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ONTHESHELF