I agree with others that this was a good puzzle with a neat endgame. Thanks to Meursault for the link to the Playfair solver, certainly helpful given that there were only four fully encoded digraph in the puzzle (Azed normally has at least eight).
Just to put me out of my misery, would someone explain the wordplay for the unstarred clue at 7d? The answer has already been confirmed on the forum as KRONE, and the extra letter is, I think, O. I have everything else.