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All answers having "Jousting weapon" as clue:

4 Character Answers:

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MACE

STYX



5 Character Answers:

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CLOCK

ENEMY

ISLAM

LANCE

PUREE



6 Character Answers:

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TRYING



7 Character Answers:

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OBSERVE

WINEBAR



8 Character Answers:

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KNITWEAR

NONSENSE



11 Character Answers:

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EXAMINATION

SPLITSECOND