[Bb] Congratulations! [Raak] You're definitely thinking about it the right way. I agree with Martha that it's a very hard clue (I didn't get it when I was reading the book.) The first letter is B. [Blob] I'm not sure if you are referring to a different occasion, but I clued "Mile End" as More? (4,3) with the idea that it should be read as "M or E"
Can you confirm if the clue should be read as a double definition, 'bust' and 'down reason', the whole therefore being something that would make you depressed, either through being broke or broken? Thanks. (Hmmm... sees the appeal of a MCiOS-u-like hidden-text feature).