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All answers having "Helpless" as clue:

4 Character Answers:

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LONE

LOST

SOLO



5 Character Answers:

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ALONE



6 Character Answers:

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UNABLE



7 Character Answers:

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UNAIDED

UPATREE



8 Character Answers:

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IMPOTENT



10 Character Answers:

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UNASSISTED



11 Character Answers:

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OVERABARREL