Crossword Genius

Would a tartan lining suit it? (3)

Ross

I believe the answer is:

mac

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If this is the answer I cannot explain how the clue works.

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(Other definitions for mac that I've seen before include "Waterproof coat (colloq.)" , "It may help you keep dry" , "Overcoat" , "A rainproof" , "Coat - computer" .)

I've seen this clue in the Evening Standard.
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