Crossword Genius

I left memo, vaguely too upset to restrain a PC addict (5,6)

Ross

I believe the answer is:

mouse potato

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'i left memo vaguely too upset' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'to restrain a pc addict' is the wordplay.
I cannot quite see how this works, but
'to' is found in the answer.
'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for mouse potato that I've seen is " he has to be at the computer".)

I've seen this clue in the Sydney Morning Herald.
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