How can I clear a Texture in a blueprint? (HMD UI log)

Hi,

I am trying to make a HUD-like UI in VR-Mode.
For this, I added some StereoLayers in my Pawn, which display live-textures at the bottom right and left of my sight:

One of it should work as a kind of Log. So I used a material which is half-opaque, and created a function to draw text to it:

As you can see from the API of the function, I want the text to vanish after a certain amount of time.

So, my question is: How can I clear a Texture (aka RenderTarget aka Canvas) in a blueprint?

Found a solution by drawing another (empty) TextureRenderTarget onto the first one: