Crossword Genius

By law, half of epic site journals must be edited (4,4)

Ross

I believe the answer is:

ipso jure

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

'by' is the definition.
Both the answer and definition are adverbs.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Guardian.
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