A little superhero me, original Casanova (5)
I believe the answer is:
romeo
'casanova' is the definition.
(both can mean a womaniser)
'a little superhero me original' is the wordplay.
'a little' indicates the answer is hidden within the clue.
'ROMEO' is hidden in the letters of 'superhero me original'.
(Other definitions for romeo that I've seen before include "Shakespearean lover" , "Comms code for R" , "He was known for loving" , "A great lover" , "Lover; R (radio comms.)" .)