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All answers having "Established" as clue:

3 Character Answers:

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SET



4 Character Answers:

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LAID



5 Character Answers:

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BASED

BUILT

FIXED

SETUP

SWORN

USUAL



6 Character Answers:

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BLOWUP

PROVEN

ROOTED

SEATED

SECURE

STATED



7 Character Answers:

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BASEDON

FOUNDED

PLANTED

WELLSET



8 Character Answers:

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ACCEPTED

INSTATED

ONTHEMAP

ORDAINED

ORTHODOX



9 Character Answers:

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STARTEDUP



12 Character Answers:

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LONGSTANDING