Famous part of them in entertainment world (7)
I believe the answer is:
eminent
'famous' is the definition.
(eminent can mean famous or influential)
'part of them in entertainment world' is the wordplay.
'part of' indicates a hidden word.
'EMINENT' is hidden within 'them in entertainment world'.
(Other definitions for eminent that I've seen before include "Outstanding or distinguished (7)" , "Important" , "Famous and respected" , "Distinguished and admired" , "Respected; distinguished" .)