Hey, look at that. My connection has stayed alive three mornings in a row. Which is handy, with me working on weekend time for two of them, and forgetting to check on my way out again this morning.
[CdM, MF, matt] O.k. I see it now - and as you say, it does have a certain elegance. My only quibble with is really is that it is a bit two-staged, in that <hidden_bit>one has to get to "bra in wash" as a reason for the bust to be down, and normally such two-stage clues are inadmissable. Like having to find a word and then anagramise it. I've seen it done, but it does cause confusion IMHO</hidden_bit>
The distinctive feature of the "bust down reason" clue is that the entire clue is simultaneously the definition and the cryptic indication, instead of them being separate halves.
[Blob] I think this what Manley calls "A clue to a clue"; but didn't you know you can excuse anything with a question mark. In any case as Raak and Darren point out, it's an &lit clue. This type of clue is what people entering the Azed clue-writing competition usually aim for. Often with disastrous consequences, as it's extremely difficult to get a clue that is both crossword-grammatically correct and furnish a sound definition of the whole.