is this cable or hydraulic clutch? check first if you have fluid @ the clutch reservoir, if you do then do this steps with the clutch pedal and tell me when the noise disappers

pedal halfway (if noise disappers then its a marcel and fork problem)
pedal all the way ( if noise disappers, then its a pilot bearing problem)

or possibly, your clutch is worn out making a chatter so in that case, you will need a new clutch.


note: some tranny shops does not charge for diagnosis, see what they say.