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All answers having "Sly" as clue:

4 Character Answers:

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ARCH

CAGY

CUTE

FOXY

WILY



5 Character Answers:

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CAGEY

LEERS

LEERY



6 Character Answers:

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ARTFUL

ASAFOX

CRAFTY

FELINE

SHIFTY

SNEAKY

TREATY

TRICKY



7 Character Answers:

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CUNNING

FOXLIKE

FURTIVE



8 Character Answers:

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STEALTHY



9 Character Answers:

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UNDERHAND



13 Character Answers:

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CRAZYLIKEAFOX