Crossword Genius

Online editor promoted assistant after rest overwhelmed by success (10)

Ross

I believe the answer is:

wikipedian

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

'online' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'editor promoted assistant after rest overwhelmed by success' is the wordplay.
I cannot really understand how this works, but
'editor' could be 'ed' (abbreviation) and 'ed' is found within the answer.
'rest' could be 'kip' (kipping is a kind of resting) and 'kip' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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