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All answers having "Boxer" as clue:

3 Character Answers:

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ALI

DEM

DOG

PUG

SEN



4 Character Answers:

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SENS



5 Character Answers:

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BREED

CASER



7 Character Answers:

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SENATOR

SPARRER



8 Character Answers:

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DEMOCRAT

PUGILIST

SUGARRAY



9 Character Answers:

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REBELLION



12 Character Answers:

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PRIZEFIGHTER

WELTERWEIGHT