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All answers having "Mac" as clue:

3 Character Answers:

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BUB

BUD

PAL



4 Character Answers:

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COAT



5 Character Answers:

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APPLE

BUDDY

FELLA

KIDDO



6 Character Answers:

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MISTER



8 Character Answers:

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RAINCOAT



9 Character Answers:

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HAMBURGER



15 Character Answers:

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BRITISHRAINCOAT