OK, well if your using a tripod you don't really need a high iso, the whole point of the tripod is to keep the camera still, the high iso will shorten the shutter speed (assuming your shooting aperture-priority) but thats not the problem here. The issue is your over exposing the clock, as Christine says take a few shots at different exposures and blend them together.
The black background is fooling the cameras meter into trying to lighten the pic, thats blowing out the lighter parts of the image.
To me it looks quite soft as well, is your tripod solid? although at the small size I'm viewing here it's a bit hard to tell (viewing on a tablet)