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All answers having "Wimp" as clue:

4 Character Answers:

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NERD

WUSS



5 Character Answers:

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DWEEB

SISSY



6 Character Answers:

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WEENIE

WIENIE



7 Character Answers:

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CRYBABY

MILKSOP

NEBBISH



8 Character Answers:

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MAMASBOY

POLTROON

WEAKLING



9 Character Answers:

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WETNOODLE



11 Character Answers:

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MILQUETOAST