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).
Yes... <hide>the clue should be read as a double definition</hide>
And, irritatingly, no... <hide>Nothing to do with depression - this may be a clue too far, but it's not "bust 'down reason'", but rather "'bust down' reason"</hide> HTH. (But not really.) :oP