Having found the puzzle, I'm no nearer the answer, however it looks like the missing letter in the OP is also the one missing in - 6a Digital music acronym (2) ?L Solving the block of clues involved isn't helped by the missing clue for 13d - I don't know if this link will work (I get access through my library) - https://www.pressreader.com/uk/mojo-uk/20220801
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