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All answers having "Plain" as clue:

3 Character Answers:

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DRY



4 Character Answers:

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BALD

BARE

DRAB

JANE

MARE

MERE

UGLY



5 Character Answers:

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CLEAR

LLANO

NAKED

OVERT

TOSEE



6 Character Answers:

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COMMON

FRUMPY

HOMELY

PATENT

RUSTIC

SIMPLE

STEPPE



7 Character Answers:

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EVIDENT

GENERIC

LEGIBLE

PRAIRIE

SAVANNA

VANILLA



8 Character Answers:

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APPARENT

DISTINCT

HOMESPUN

MANIFEST

OBSIDIAN

ORDINARY



9 Character Answers:

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DOWNRIGHT

EASYTOSEE

UNADORNED

UNCOLORED



11 Character Answers:

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SELFEVIDENT



14 Character Answers:

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TREELESSREGION