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All answers having "About" as clue:

3 Character Answers:

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CIR

ISH

OUT

RHO



4 Character Answers:

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ASON

ASTO

CIRC

COME

ERNI

GADS

INRE

NEAR

ONOR

ORSO

SOME



5 Character Answers:

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ANENT

ASFOR

ASTIR

CIRCA

SOBRE

UBOAT

UPAND



6 Character Answers:

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AROUND



7 Character Answers:

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ROUGHLY



9 Character Answers:

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REGARDING



10 Character Answers:

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CONCERNING

INREGARDTO



13 Character Answers:

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APPROXIMATELY