Ducati starters can barely turn over the engine at the best of times. Two big pistons and a high compression are the culprits. If you're coming from a Japanese bike, then it's going to look like you have a problem. Same with the noises you're hearing. If it goes away when you pull in the clutch, it's perfectly normal. Go and have a listen to another big capacity Ducati being started up, and compare.
Fit a heavy duty gel-type battery if you need a replacement. (It'll still turn slowly, but it'll turn slowly for longer without flattening..!)
Here's an example of Ducati clutch rattle. Some sound better/worse..!
YouTube - DRY CLUTCH SOUNDCHECK: duc 900 ss