I'd realised the theme, but can't see the 5-letter solution to the cryptic clue, nor the path through 29 cells. I can guess what the quotation is, but can't see it anywhere in the grid.
46a is another one I'm struggling with. I believe the definition is weasel, and it seems to be a popular weasel in the Listener, having appeared just two weeks ago, but I can't parse the clue.