Despite the fact that I had to use Google to be sure of the various references to 1/18Ds, with the initial letter in lower case so as to become more general than that building to which tourists and black birds flock, I found this to be more straightforward than some of Morph’s crosswords. Which is not to say that it wasn’t good. It was.
Definitions in italics (although the 1/18D references are also definitions in a way, they are not in italics).