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All answers having "Inoperative" as clue:

3 Character Answers:

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DUD

OFF

OUT



4 Character Answers:

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DEAD

DOWN

IDLE

NOGO

VOID



5 Character Answers:

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KAPUT



7 Character Answers:

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DEFUNCT

STALLED



9 Character Answers:

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NONACTING



10 Character Answers:

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ONTHEBLINK

ONTHEFRITZ

ONTHESHELF

OUTOFORDER



15 Character Answers:

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DEADASADOORNAIL