Media star adapted to stage (9)
I believe the answer is:
dramatise
'stage' is the definition.
('stage'->'dramatize' is in my internal thesaurus and 'ize'->'ise')
'media star adapted' is the wordplay.
'adapted' is an anagram indicator.
'media'+'star'='mediastar'
'mediastar' anagrammed gives 'DRAMATISE'.
'to' acts as a link.
(Other definitions for dramatise that I've seen before include "Make out to be exciting or important" , "adapt for TV" , "prepare for the stage" , "Overstate" .)