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Why would you hear a grinding noise from clutch when idling?
This happened to me 2 months ago on my Astra. New clutch! Unfortuantely it means clutch plate is knackered. replace it whilat the car is still driveable or it'll go on you at the worst possible time!
Your clutch is worn out,your pressure plate is shot,or there is a broken spring inside your clutch,you have to drop your tranny to check this out,been there ,done that! good luck,,toro2.
One might describe is as rolling thunber while the bowling balls roll down the lane, then there is a loud crack as it hits the pins. There is also usually laughter and talking.