Some superstar comedian turned politician (8)
I believe the answer is:
democrat
'politician' is the definition.
(Democrat is an example)
'some superstar comedian turned' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'turned' is a reversal indicator.
'tarcomed' is hidden within 'superstar comedian'.
'tarcomed' in reverse letter order is 'DEMOCRAT'.
(Other definitions for democrat that I've seen before include "Clinton or Obama supporter" , "US political party supporter" , "Political type" , "Believer in government of, for and by the people" , "Republican's US rival" .)