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The background can be turned off which may help. I changed the clock color to red and 'None' for the background and it didn't mask anything else, even on the Nook. On my phone I could still read the chart, even with the clock covering part if the staff. I don't normally use the clock. Personally, after trying this, I think what is available works fine. Since it's the background color that seems to cause the masking, don't us a background.
Would it help if the clock was translucent? Is that easy to code?
Oh, the position in the right upper, corner is where I look automatically for a clock.