see below, but define clutch drag. Does the bike creep forward when you engage first gear even when the lever is on the bars? they all clunk when you engage 1st gear, the higher the revs, the worse the clunk, ie still on choke.
Mine did that when I bought it, standard lever etc. fluid looked ok. I was advised by Jaws to do a master cylinder repair kit, which I did. That helped, but it only lasted a few weeks. Next I tried the slave cylinder repair kit. When I stripped the slave cylinder, the previous muppet who fitted the O ring had nicked it in two places and removed two big lumps of rubber which were floating around in the cylinder. Once I replaced the piston, which was corroded slightly and the seals, the Clutch has been perfect since. Due to the crappy location of the slave cylinder, where it does collect crud off your chain, I would personally start by servicing this. A set of rubbers and a new piston will cost you peanuts. I read on another forum a theory that bikes with Scott oilers fitted had a higher failure rate of the slave cylinder seals, and the theory is that the oil from the Scott oil contaminates the rubbers leading to an earlier fail rate. There was also a simple mod using a piece of plastic cut from a washing up bottle which folk had done to stop as much crud from entering the end of cylinder. Unfortunately I cant find it but if I do I will post it on here.
PS bleeding the clutch was a twat of a job, if you know anyone with a fluid puller kit, I suggest you try and borrow it. if not they are not expensive off Jaws or other retailers.