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All answers having "Standard of comparison" as clue:

4 Character Answers:

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TOFF



5 Character Answers:

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WRIST



6 Character Answers:

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EXETER

STATUS

WEIGHS



7 Character Answers:

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MEASURE



8 Character Answers:

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BASELINE



9 Character Answers:

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YARDSTICK



10 Character Answers:

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TOUCHSTONE



14 Character Answers:

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MEASURINGSTICK