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All answers having "Surprises" as clue:

5 Character Answers:

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JOLTS

STUNS



6 Character Answers:

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AMAZES

POPSIN



8 Character Answers:

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SNEAKSUP

STARTLES



10 Character Answers:

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CURVEBALLS

EYEOPENERS

GETSTHEDON

SNEAKSUPON



12 Character Answers:

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THROWSACURVE



15 Character Answers:

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CATCHESOFFGUARD