An envious, ill oddball follows friend of Hermione and Harry Potter (6,9)

I believe the answer is:

ronnie osullivan

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

'hermione and harry potter' is the definition.
I know nothing about this answer so I can't judge whether this works.

'an envious ill oddball follows friend' is the wordplay.
'oddball' indicates an anagram.
'follows' says to put letters next to each other.
'friend' becomes 'ron' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'an'+'envious'+'ill'='anenviousill'
'anenviousill' anagrammed gives 'nieosullivan'.
'nieosullivan' after 'ron' is 'RONNIE OSULLIVAN'.

'of' is the link.

Can you help me to learn more?

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.