The clutch bearing seems to have gone bad. There is a rattling noise when idling that goes away when the clutch is pressed.
The clutch release bearing is the most likely cause of this noise. If so, then the transmission would need to be removed to service it. I recommend having a mechanic, such as one from YourMechanic, come to you and run a diagnostic on your faulty clutch issue.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing