For quick testing and development, it would really be helpful to have a way to clear the Bulletin from processor's top right corner. Once I see the error and I fix it, I would like to clear it before restarting.
If it is possible with the current version, please guide.
As mentioned in the comments there is currently no way to do this. However, you can probably achieve your goal of seeing whether your error is resolved in the following way:
This has helped me greatly in speeding up development.
Extra trick:
If you are really in a place where you can safely play around, and don't want to focus, you can also copy the processor and re-direct the queues to/from there. It is more work, but will get you a clean bulletin.
I mostly used this trick if I had to demo something and I cannot afford to wait 5 minutes for the red square to disappear.