My car has had this issue for a while where if the clutch pedal is in any gear, neutral or anything as long as the clutch pedal is released then it will make some kind of noise, it is hard to describe exactly. I was looking at different bearing it might be but I really at this point have no idea. Supposedly according to the mechanic that did another unrelated job my clutch pedal is hard. I ran some test that I found on line to make sure my clutch was in proper working condition. I think if I had to put it in words it sounds like some kind of line is loose just like a chirp sort of.