Agreed 1a was a bit weak, but in addition to the "magical" reference, the clue is a dd, which was one of the subject's trademarks. I also found 6 difficult to parse, though the solution was clear, though dependent on GK I had to look up.
I thank Paul again for a thoughtful puzzle. I had to wonder if he had it composed ahead of time. Or perhaps news of the subject's passing was disseminated privately.