Crossword Genius

Computer club loses backing (3)

Ross

I believe the answer is:

mac

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

'computer' is the definition.
(Apple Mac computer)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mac that I've seen before include "laptop?" , "Overcoat" , "one used in shower?" , "Waterproof raincoat, in short" , "A rainproof" .)

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