GPU profiler Clear?

In the profiler the state Clear under ‘RenderForwardOpague’ (GPU) is taking up around 15-20ms.

Why is it taking that long to render when using skybox or solid color as flag? How can I reduce this?

EDIT: This problem still consists and I still have no clue what is causing it to be that high, my graphics card is a NVIDIA GTX 770

Found out that this was mainly caused by a outdated graphics driver.