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All answers having "Buck" as clue:

3 Character Answers:

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ONE

RHO



4 Character Answers:

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CLAM

DEER

DEFY

EURO

MALE

ONER

REAR

STAG



5 Character Answers:

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PEARL



6 Character Answers:

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DOLLAR

OPPOSE

RESIST

SPENDA



7 Character Answers:

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ONECLAM

ONESPOT

SMACKER



8 Character Answers:

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SIMOLEON



9 Character Answers:

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GREENBACK

SMACKEROO



10 Character Answers:

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DOLLARBILL

MALERABBIT

ONESMACKER



12 Character Answers:

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ARGUEAGAINST

DISAGREEWITH



13 Character Answers:

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KINDOFPRIVATE

NOVELISTPEARL



15 Character Answers:

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DOGBYJACKLONDON

TAKEEXCEPTIONTO