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All answers having "Bush" as clue:

3 Character Answers:

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ELI

ERA

HAT

REP

TOD



4 Character Answers:

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AFRO

ELIS

PRES

VEEP



5 Character Answers:

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AFTER

ELDER

FLORA

LAURA

POTUS

SHRUB

TEXAN

YALIE



6 Character Answers:

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UNITER



7 Character Answers:

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OUTBACK



8 Character Answers:

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LASTNAME



9 Character Answers:

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PRESIDENT



10 Character Answers:

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AMATEURISH



12 Character Answers:

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QUAYLEHUNTER



15 Character Answers:

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CLUSTEROFSHRUBS