Slack = absolutely no tension on the cable
The clutch lever should move the first few millimeters without pulling on the cable at all. If you don't have this the clutch can't fully engage and it slips. The clutch plates are held together by spring tension. When you pull on the clutch lever it pulls the plates apart. I know thats not a real good description but I'm at a loss as how to explain it better without drawing pictures.
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