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All answers having "Commonplace" as clue:

5 Character Answers:

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BANAL

LOWLY

PROSY

STALE

TRITE

USUAL



6 Character Answers:

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HOMELY

NORMAL

OLDHAT



7 Character Answers:

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AVERAGE

PROSAIC

ROUTINE

TYPICAL



8 Character Answers:

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ADMONISH

BROMIDIC

EVERYDAY

MEDIOCRE

ORDINARY

PLEBEIAN

WELLWORN



9 Character Answers:

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PROSAICAL



10 Character Answers:

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DIMEADOZEN

PEDESTRIAN



12 Character Answers:

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MATTEROFFACT



13 Character Answers:

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GARDENVARIETY

UNEXCEPTIONAL



14 Character Answers:

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BREADANDBUTTER