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All answers having "Extinct" as clue:

3 Character Answers:

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DYE

MOA



4 Character Answers:

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DODO

GONE



5 Character Answers:

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DOILY



6 Character Answers:

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NOMORE

WEEKLY



7 Character Answers:

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DEFUNCT



8 Character Answers:

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LONGGONE

WRITEOFF



11 Character Answers:

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DEADASADODO