A bit late to the party here, and struggling to follow this thread. I think I have all the solutions but I'm not sure I can see any special features, apart from a few alliterations and other connections.
I'm a bit unsure of 8a, although my answer parses beautifully with or without a definition. Is the definition the first word, because it seems only very loosely connected to the solution, unless there is some technical usage I'm unaware of? Or is this related to the special feature?