The clock will prise out of the dash board. Be sure to use tools that will not mark the dash or the edges of the clock. Try gently prising on the left and right edges and the clock will come out. The bulb is on the right and comes out with a 1/4 turn anti-clockwise. It's the same bulb as the rest of the dash.
You can disconnect the power to the clock by removing the multi-connector at the back.
