Soprano has articles about Les Mis's opening in rep (8)
I believe the answer is:
salesman
'rep' is the definition.
(I've seen this before)
'soprano has articles about les mis's opening' is the wordplay.
'soprano' becomes 's' (musical abbreviation).
'has' is a charade indicator (letters next to each other).
'articles' becomes 'aan' (a and an are indefinite articles**).
'about' means one lot of letters goes inside another.
'opening' says to take the initial letters.
The initial letter of 'miss' is 'm'.
'les'+'m'='lesm'
'aan' going around 'lesm' is 'alesman'.
's'+'alesman'='SALESMAN'
'in' is the link.
(Other definitions for salesman that I've seen before include "Death of a . . . . . . . . (Arthur Miller) (8)" , "Travelling rep" , "Company representative" , "Willy Loman" , "Arthur Miller wrote 'Death of a . . . . . . . .'" .)