Celebrity from London won Eritreans over (6)
I believe the answer is:
renown
'celebrity' is the definition.
('renown' can be a synonym of 'celebrity')
'from london won eritreans over' is the wordplay.
'from' indicates a hidden word.
'over' shows that the letters should be reversed in order.
'nwoner' is hidden in the letters of 'london won eritreans'.
'nwoner' back-to-front is 'RENOWN'.
(Other definitions for renown that I've seen before include "Good reputation" , "Fame and distinction" , "Plane's maximum width" , "Fame and eminence" , "High reputation, fame" .)