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All answers having "Kaput" as clue:

3 Character Answers:

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OER

RHO



4 Character Answers:

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DEAD

DONE

FINI

OVER

PFFT

SHOT



5 Character Answers:

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ENDED



6 Character Answers:

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BROKEN

RUINED



7 Character Answers:

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ATANEND

DEFUNCT

DONEFOR

USELESS



9 Character Answers:

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BURNEDOUT



10 Character Answers:

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NOTWORKING

ONTHEBLINK

ONTHEFRITZ

OUTOFORDER



11 Character Answers:

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GONEHAYWIRE

INDISREPAIR

INOPERATIVE



15 Character Answers:

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DEADASADOORNAIL

OUTOFCOMMISSION