Cockney star twitching, arousing certain feelings (6)
I believe the answer is:
erotic
'arousing certain feelings' is the definition.
(arousing sexual feelings)
'cockney star twitching' is the wordplay.
'cockney star' becomes ''ero' ('hero' - both can mean a main character - said with the 'H' dropped - a cockney accent.).
'twitching' becomes 'tic' (tic is a kind of twitching).
'ero'+'tic'='EROTIC'
(Other definitions for erotic that I've seen before include "Steamy" , "Sensual" , "Titillating" , "Loving composition" , "Relating to sexual pleasure" .)