Crossword Genius

We're told how to use the internet in excess (7)

Ross

I believe the answer is:

surfeit

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'excess' is the definition.
(I know that excess can be written as surfeit)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for surfeit that I've seen before include "it's more than one needs" , "having had quite enough" , "Fustier (anag)" , "excessive amount" , "stuff, once" .)

I've seen this clue in The Guardian.
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