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All answers having "Slicker" as clue:

3 Character Answers:

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MAC



4 Character Answers:

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CITY

COAT

DUDE



5 Character Answers:

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ICIER

SLYER



6 Character Answers:

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EELIER

OILIER

WILIER



7 Character Answers:

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OILSKIN



8 Character Answers:

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RAINCOAT

RAINWEAR



13 Character Answers:

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FOULWEATHEEAR



14 Character Answers:

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KINDOFRAINCOAT