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All answers having "Fault" as clue:

3 Character Answers:

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SIN

TOA



4 Character Answers:

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FIND

FLAW

HOLE

ONUS

RIFT

VICE



5 Character Answers:

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BLAME

CULPA

ERROR

ITSMY

LAPSE



6 Character Answers:

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DEFECT



7 Character Answers:

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DEMERIT



11 Character Answers:

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SHORTCOMING