Very unlikely to be the motor. They're apparently very hard to kill. If the motor isn't producing sufficient torque it is more likely an almost break in the wire. To eliminate the clog possibility you should help the extruder along by pushing with your hand. It could be that your Teflon tube has narrowed, they do that when they wear under heat. You may also have wear or sag in the extruder assembly so it isn't holding the idler against the filament very tight. Though the symptom there wouldn't be motor clicking. You'd get the filament slipping against the turning gear instead.