Crossword Genius

Do computers up (4)

Ross

I believe the answer is:

scam

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'do' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scam that I've seen before include "A slangy swindle or fraud" , "Fraudulent trick or swindle" , "Hoax" , "Confidence trick, swindle" , "fiddle" .)

I've seen this clue in The Times.
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