gadgeteer - As willtill correctly points out, I had a similar issue recently. The level of my fluid was not low, but started having the bike creep with the clutch fully pulled in all of the sudden. Agree with willtill and BIGLRY that it likely went to the slave cylinder. While the fluid can go into the engine via a leaky slave cylinder, there is also a weep hole there that's supposed to allow it out and provide a visual indication of the leak (if it's not plugged).
Once you have the lower cowl and evap canister off, you'll be able to see the slave. The weep hole is on the casing just to the shifter side of the bike, just above the oil filter. It's easiest to see the weep hole if you also remove the lower side cover (that fits around the shifter). Please refer to the photo attached. It's at the orange arrow. In the interest of transparency...I don't own the photo...just found it on the interwebs.
By the way, if it's the slave cylinder, a complete unit is about $100 on line. Kit to rebuild it is <$30 online IIRC. Getting the air out of the system takes quite a bit of flushing/bleeding, BTW. Good luck, and keep us posted!