As long as it isn't a metal to metal sound, we used to have that type of problem with bikes that sat for longer lengths of time. Just sitting, the clutch face plates get sticky, jerky and can make noise until they "wear back in". Usually just riding them for a while would resolve the problem, but if it persists it could be worn clutch plates, loose clutch bolts or weak clutch springs. Are you having to pull the clutch lever further than you remember to disengage the clutch? That could also be a symptom of wear. Assuming you have followed directions as far as the oil used, you might also check the clutch master for overfill, as Mole99 suggested. Although I would think you would know if you overfilled the master. That could lead to the noise but probably not the jerkiness.
It may not be a bad idea to take off the clutch side case and do some investigation. It isn't difficult. Drain the oil, remove the clutch cover, take loose the clutch bolts, springs and plates. Make sure to keep the plates in order. Measure the plate faces and spring lengths for serviceability, replace as necessary. Put the clutch plates back in the same order. Retorque the clutch bolts to spec.
Worst case, if it is metal to metal sound (and you should be able to tell), you have a broken clutch bolt. Don't ride it or start it! Continuing to ride it like this can lead to major engine failure.
Let us know how this turns out. Good luck.
2014 GTL Exclusive, 2018 Goldwing DCT, 2017 KTM 1290 SDGT, 2014 KTM 500 Exc, 2011 KTM 990 Dakar, 2004 Goldwing