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All answers having "Common ___" as clue:

3 Character Answers:

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ERA



4 Character Answers:

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AREA

CORE

NONU

PARK



5 Character Answers:

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CHEAP

CRASS

SENSE

USUAL



6 Character Answers:

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VULGAR



7 Character Answers:

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AVERAGE

GENERAL



8 Character Answers:

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PLEBEIAN



9 Character Answers:

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TOWNGREEN



10 Character Answers:

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DIMEADOZEN

WIDESPREAD



11 Character Answers:

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ADIMEADOZEN



12 Character Answers:

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VILLAGEGREEN