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All answers having "Assemble" as clue:

3 Character Answers:

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LAY

RIG

SIT



4 Character Answers:

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FORM

MAKE

MASS

MEET



5 Character Answers:

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AMASS

BUILD

ERECT

RAISE

RALLY

RIGUP

SETUP

SILLY

UNITE



6 Character Answers:

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GATHER

MUSTER



7 Character Answers:

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COLLECT

COMPILE

CONVENE

ENTWIST

IMPANEL

MARSHAL

ROUNDUP

TREMBLE



11 Character Answers:

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GETTOGETHER

PUTTOGETHER