Crossword Genius

Mum, cold, needs raincoat (3)

Ross

I believe the answer is:

mac

(Other definitions for mac that I've seen before include "Waterproof raincoat, in short" , "Overcoat" , "It may help you keep dry" , "laptop?" , "A Gaelic son, often in name" .)

I've seen this clue in The Sun.
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