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All answers having "Inform" as clue:

3 Character Answers:

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ARC

RAT

SIR



4 Character Answers:

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BLAB

CLUE

POST

TELL



5 Character Answers:

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BRIEF

CUEIN

EDIFY

TEACH



6 Character Answers:

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CLUEIN

NOTIFY

SNITCH

SQUEAL

TATTLE



7 Character Answers:

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APPRISE

EDUCATE

LETKNOW

TRAFFIC



8 Character Answers:

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ACQUAINT

CORPORAL

OCCURRED



9 Character Answers:

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ENLIGHTEN



12 Character Answers:

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OLDFASHIONED