Check fuses, then relays, if it's anyting like my 86. I just went through this on mine. Both fog lights did not work. I figured it had to be something above the bulb. I found fuses OK, and the relay OK (just switched it with another one in the box temporarily). I ha dto check the lights then, and found BOTH of them blown. First time that's ever happened.
When your car is in netral, with the clutch engaged (pedal up) the throw-out (realease) bearing should not be turning (In some cases the release bearing may have slight pressure on it and it may be freewheeling as it just barely touches the pressure plate). Your transmission input shaft IS turning. When you depress the pedal, to disengage the clutch, the throw-out bearing begins rotating with pressure on it, as it is now supporting the release fingers of the presure plate.
From what you describe, it could be an input shaft bearing. It is less likely it is the throwout bearing, but possible since, as I said, in some cases the bearing will turn with little pressure on it just because it is touching the pressure plate fingers.
Doesn't make this noise in gear,, riding down the street?