The problem with the market is that everything you do is affected by other factors. Things such as the oil crisis, the war, changes in law etc. Everything will leave a mark on the stock market. What happened is that Clear channel was trying to offload a s--tload of bonds, but concurrently, Lehman Bro's went south. Because of the demise of Lehman Bros, the whole market suffered and Clear channel was included in the casualty list.
So no, while there is no obvious connection between the two corporate entities, what happened to one, drastically affected the other (clear channel) adversely.