A new prefix, one I prepared earlier? (3)

I believe the answer is:

neo

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

'a new prefix' is the definition.
(I've seen this in another clue)

'one i prepared earlier?' is the wordplay.
'one' anagrams to 'NEO'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for neo that I've seen before include "language" , "Prefix meaning new - try one" , "New (suffix)" , "Prefix donating new" , "Prefix meaning new or recent" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.