A clutch doesnt tend to go out like that. Useually what will happen is that you won;t be able to shif because the clutch is worn.
Now if the shifter won;t come out of gear (weather started or with the car of) you usually have a syncro problem.
If you can move the shifter in any gear weather the clutch is engagued or not (car on) then you usually have a diff problem.
To test if your clutch is bad, put the car into nutral if you can (before starting) start car, then try to shift into gear...if its only the clutch then you will grind as you try to shift.but if it goes into gear, then it could be one of the combo i mention above....Remember A clutch is a ware item. it usually won;t just "stop working" you will notice the diffrence when a clutch begins to go bad as a graduall effect. Usually....there are though freak cases of them going bad.
Roz