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All answers having "Establishes" as clue:

4 Character Answers:

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PINS

SETS



5 Character Answers:

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BASES

SEATS



6 Character Answers:

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BUILDS

ERECTS

FOUNDS

PROVES

SETSUP



7 Character Answers:

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CREATES

ENROOTS

ORDAINS



8 Character Answers:

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INSTATES