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All answers having "Big hit" as clue:

3 Character Answers:

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POW



4 Character Answers:

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BLOW

BOFF

SWAT



5 Character Answers:

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BOFFO

HOMER

SMASH



6 Character Answers:

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TRIPLE

WALLOP



7 Character Answers:

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HOMERUN



8 Character Answers:

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BODYBLOW

SOCKEROO



9 Character Answers:

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NUMBERONE

SMASHEROO



10 Character Answers:

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BESTSELLER



15 Character Answers:

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SMASHINGSUCCESS