Crossword Genius

A little machine that's waterproof (3)

Ross

I believe the answer is:

mac

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'waterproof' is the definition.
(mac is a kind of waterproof)

'a little machine that's' is the wordplay.
'a little' indicates taking the first letters.
'that' becomes 'ac' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letter of 'machine' is 'm'.
'm'+'ac'='MAC'

Can you help me to learn more?

(Other definitions for mac that I've seen before include "Waterproof raincoat, in short" , "Waterproof coat (colloq.)" , "It may help you keep dry" , "laptop?" , "PC" .)

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