2000 LX 5spd awd
Starter imo. When it's clicking hit with a hammer and long extension while some one is turning the key, if it starts it's the starter.
Yes the main relay is behind the glove box on the body.I would also chase the alarm problem you’re having as Lochinvar has suggested.
I may also consider plugging in an obd2 scanner to see if any codes are showing up ...
A clicking from the glovebox area could be a relay going bonkers. I’m not sure of the layout of the Gen1, but the Gen2 PCM plus a handful of relays are behind the glovebox.