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All answers having "Done for" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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DEAD

GONE

SUNK



5 Character Answers:

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KAPUT

SPENT

TOAST



6 Character Answers:

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AGONER

DOOMED

KAPUTT

RUINED



7 Character Answers:

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DEADASA

HISTORY

UPATREE



8 Character Answers:

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WASHEDUP



11 Character Answers:

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ALLWASHEDUP



15 Character Answers:

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DEADASADOORNAIL