Stuck on three (!) so any help appreciated.
11 A: Book character none follow in a period setting (4) I have E??A - can only think of EMMA.
12 D: Music odd band left half finished (5) I have ??M?A; first letter is third of 11 A.
14 D: Leading lady reflected on date gone wrong (5) I have E?R?D, and have seen this answered on here as EARLY and ERRED. ERRED fits with 23 A, which I have as EDIT.