Welcome. First, that clutch is gone.. so replace it.. completely...and as it like like it's covered with oil, the shaft seal and probably the bearing will need replaced if it has a wet clutch(didn't mention the year) and if it does have one, check that the springs and shoes are in good condition. If no wet clutch then find and fix the source of the contamination and replace the one-way bearing. It may feel tight, but it's failing.