Crossword Genius

Scotsman in rainwear (3)

Ross

I believe the answer is:

mac

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'scotsman' is the first definition.

'rainwear' is the second definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?

'in' is the link.

Can you help me to learn more?

(Other definitions for mac that I've seen before include "laptop?" , "Coat - computer" , "A rainproof" , "PC" , "A Gaelic son, often in name" .)

I've seen this clue in The Sun.
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