Celebrity coming from nowhere, now nobody (6)
I believe the answer is:
renown
'celebrity' is the definition.
('renown' can be a synonym of 'celebrity')
'coming from nowhere now nobody' is the wordplay.
'coming from' indicates the answer is hidden within the clue.
'RENOWN' can be found hidden inside 'nowhere now nobody'.
(Other definitions for renown that I've seen before include "Fame and eminence" , "Celebrity, fame" , "Good reputation" , "Fame and public acclamation" , "High repute" .)