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All answers having "Set up" as clue:

3 Character Answers:

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LAY

LEG

PAL

RIG



4 Character Answers:

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REAR

TEED

TRAP



5 Character Answers:

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ENDOW

EQUIP

ERECT

FRAME

RAISE



6 Character Answers:

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ENTRAP

FOOLED

FRAMED

INSTAL

REARED

RIGGED

STAGED



7 Character Answers:

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ARRANGE

CHAGRIN

ERECTED

INSTALL

INSTONE

OFFBEAT

PREPARE

READIED

ROLLOUT



9 Character Answers:

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ESTABLISH

INSTALLED

INSTITUTE



11 Character Answers:

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DISENCUMBER

ESTABLISHED



12 Character Answers:

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REINVIGORATE