1995 Nissan Maxiuma clock not working

There is no separate fuse for the clock. Most things are either included under the instrument cluster or accessories fuse.

sounds like the thermostat is stuck open, meaning the engine is not getting up to running temperature. would be best to change the thermostat and give the water system a good flush out. and back flush the heater core. as you don't know how long this problem has been around it can cause rust build up in the engie as flow is weaker. when topping up use a good inhibitor antifreeze/summer coolant 50/50 mix. and run for a year with this mix in and replace it. and flush again this should of then sorted the corrosion in the water system.

Check your fuses carefully. There are sometimes two (2) fuses for the radio... one to actually work the radio (usually has power only when key is on) and one to work the memory and clock (has power all the time)

I don't think you can even get starter brushes,unless we roll the clock back to 1970.

CHECK THE MAIN CIRCUIT BREAKER.

Check the fuses

It is very common for those to burn out. Nothing you can do to fix it except replace it.

Probably not a lens cover at all. It's just a 1 piece plastic headlight. It you are wanting to replace a bulb , they go in from the back . Open the hood and you should be able to see where the wires to the bulb go in the back of the headlight.

driver side switch is not working replace it

You don't need t-belt until 105000 miles. Interval for nissan t-belt was 60K miles until 1995. Anything above 1995 is 105000 miles.