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All answers having "Dirty" as clue:

3 Character Answers:

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LOW

MAR



4 Character Answers:

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BLUE

IDEE

LEWD

SLUR

SOIL



5 Character Answers:

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GRIMY

MUCKY

MUDDY

SALTY

SOOTY

TAINT



6 Character Answers:

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BESOIL

BISQUE

GRATES

GRUBBY

OUTLET

RATEDX

SOILED

XRATED



7 Character Answers:

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BEGRIME

LAUNDRY

POLLUTE

RATTRAP

SMUDGED

UNCLEAN

UNKEMPT



8 Character Answers:

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BEGRIMED

RATSNEST

UNWASHED