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All answers having "Hard hit" as clue:

4 Character Answers:

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BLOW

SLAM

SMIT

SWAT



5 Character Answers:

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SMASH



6 Character Answers:

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WALLOP



8 Character Answers:

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SCREAMER



9 Character Answers:

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SMACKEROO



15 Character Answers:

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CRUNCHINGTACKLE