Originally starring in Evita, perhaps, chap becomes particular (8)
I believe the answer is:
personal
'particular' is the definition.
(thesaurus)
'originally starring in evita perhaps' is the wordplay.
'originally' says to take the initial letters.
'in' indicates putting letters inside.
'evita' becomes 'Peron' (nickname of Eva Peron).
'perhaps' becomes 'al' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letter of 'starring' is 's'.
's' inserted into 'peron' is 'person'.
'person'+'al'='PERSONAL'
'chap becomes' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for personal that I've seen before include "Applied to a particular individual" , "Belonging to an individual" , "Of private concern" , "Wounding" , "Of one's private life - nobody else's business" .)