You can open the control panel and disconnect the clock wiring at the wire nuts. Disconnect both skinny little black clock motor wires, and put the wire nuts back on the stove leads. (the clock motor leads are safe to leave bare, it can't generate any power, but tidy them up if you can.) You won't have any trouble identifying the clock motor leads. They're the only scrawny wiring in there, everything else is much beefier. They exit from a single small round hole in the clock module if I remember corectly, but its been a while.

Its also possible to disassemble the clock, clean it, and put it back in service. The noise is almost certainly coming from inside the little round synchronous motor can. The bit that kind of floats on two pins between brass blocks... It will float nicley with less mechanical load from the gears pushing it off to the side, and stop making that annoying wobble / chuffle / scrape sound. You don't need to open the can. removing the gunky kitchen grease from the gear train outside the can is what's required.
One Caveat ---- Do not attempt to clean the painted clock digit wheels. The binder in the paint is no longer effective and the pigment will come off no matter how careful you are. Either protect the digit wheels from your gear cleaning efforts, or you'll need to find someone who paints model trains to fix the numbers that vanish.