Yep, as AliBaba said - nothing to do with clutch.
In neutral the crank output to gearbox input rotatates the input shaft in the gearbox, without gear engaged it rotates free together with intermediate shaft but aided with a thick transmission oil (viscosity) a little of this oil friction torque goes into the output shaft - hence little turning your rear wheel, especially noticable with the cold engine when the oils are still thick.
As of clutch, it's as with any clutch - make sure you have sufficent slack on the cable or you'll wear out your clutch too fast.
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