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All answers having "Slow" as clue:

3 Character Answers:

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RHO

RIT



4 Character Answers:

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DUMB

LATE

LAZY

OWLS

POKY

STEM

TAME



5 Character Answers:

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BRAKE

DELAY

DENSE

INERT

LARGO

LENTO

SLACK

SLOTH

TARDO

TARDY

UNAPT



6 Character Answers:

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ADAGIO

HINDER

MINUET

OBTUSE

REININ

RETARD



7 Character Answers:

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ANDANTE

ANTONYM

DOGTROT

DRONISH

GRADUAL

MINUETS

SLOGGER



8 Character Answers:

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DAWDLING

KNUCKLER

PLODDERS

SLUGGISH



9 Character Answers:

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LEISURELY



10 Character Answers:

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DULLWITTED

SNAILPACED



11 Character Answers:

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REDUCESPEED