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All answers having "Slick" as clue:

3 Character Answers:

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ICY

MAG

SLY

WET



4 Character Answers:

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DEFT

GLIB

NEAT

OILY

WILY



5 Character Answers:

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ADEPT

OILED

SUAVE



6 Character Answers:

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ARTFUL

FLOSSY

GLOSSY

GREASY

SHREWD

SMOOTH



7 Character Answers:

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OILSPOT