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All answers having "Measuring stick" as clue:

3 Character Answers:

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ROD



4 Character Answers:

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ACNE

EDAM

RULE



5 Character Answers:

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CARAT

CHESS

RULER



6 Character Answers:

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BOUGHT

GLYCOL

OBERON

RIGOUR

TINKER



7 Character Answers:

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TERRIER

UNEARTH



12 Character Answers:

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SHOTINTHEARM