I would concentrate on the clock or the door light. First I would take the bulb out of the overhead light and run the car for a day or so with a new fuse. If it blows, that will tell you that it's not the light. If it doesn't blow, that will tell you there's an issue with the light or it's wiring. If fuse does blow with the bulb out, put bulb back in, and then unplug power wire to the clock. Put in fresh fuse and drive car for a day. If fuse blows with the clock unplugged, you now will know that it's either the garage door opener or keyless entry. If it's either of those, I would bring to a dealer and let them figure it out. Too many variables to figure out by yourself without proper equipment.