Thought this was really nice, the anagrams held me up for a while as I thought they were the clashes! Enjoyed working out how to draw the lines. As others, needed a hint from here to get 41d.
Can't parse 31a.
Did anyone else think that "clashes at their intersections" in the preamble should read "entries at their intersections"? Because it needs the other intersection, which isn't a clash. And anyway, it's the entries you use, not the clash itself. Unless I'm missing something...