Man United star that is as Aeneas to Achates (6)

I believe the answer is:

bestie

'as aeneas to achates' is the definition.
(Aeneas and Achates are best friends in Greek myth)

'man united star that is' is the wordplay.
'man united star' becomes 'best' (footballer George Best).
'that is' becomes 'ie' (synonyms).
'best'+'ie'='BESTIE'

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.