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All answers having "Proportion" as clue:

4 Character Answers:

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PAGE

RATE



5 Character Answers:

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ALLOT

QUOTA

RATIO

SCALE

TILTH

WHEAT



6 Character Answers:

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PLAICE

SICKLE



7 Character Answers:

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HARBOUR



8 Character Answers:

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TUTORIAL



10 Character Answers:

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PERCENTAGE



12 Character Answers:

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BRILLIANTINE