Ironically, I have ground to a halt after about a dozen clues, and came here to hopefully pick up a nudge or hint or two, only to find the halls of wisdom quiet and deserted as everyone seems to have found this one straightforward! Perhaps I just need to get my brain into the right gear. Maybe going back to it and telling myself it's easy will help...? I think I've discerned the thematic material, but I'm a long way from having any of the descriptions yet. Onward and upward...