Just a final thought from me on this, I was initially thrown by the phrase in the preamble "Before solving a thematic number of clues....".
I took this to suggest that
a specific number was probably going to be present in the theme so, having first my thematic character starting 'A', I made the assumption that the theme could perhaps be 'Twelfth Night'. Having got back on track with the correct author, I then tried to shoe-horn my answers into 'Ten Little.....'
Wouldn't the preamble have been better to say "Before solving a number of thematic clues....'? Am I still missing something or just being pedantic?