"WHAT DO YOU DO IF THE CLUTCH WARNING LIGHT STAYS ON?"
Pull the circuit breaker to the clutch, come home carefully.
I would suggest to follow the EP as per the POH. If the clutch light remains on for longer than 7-8 seconds in flight, pull the breaker immediately and get back on the ground with the same urgency. Prepare for a drive train failure and subsequent autorotation.
It could be a failure of the motor or circuit (no big drama), but it could also be an impending failure of the belts, or one of the clutch bearings disintegrating (big drama).
Under normal circumstances, the light will not stay on longer than about 4 seconds in flight.