If the clutch chatters or has a burnt smell one of two things are usually wrong.
1 the clutch in need of repair or replacement , could have a spring broken in the disk, bad throwout bearing , could have a problem with clutch slave or master cylinder. Could have a flywheel that was not resurfaced if a new clutch was installed.
2 if this is your first manual transmission you may be slipping the clutch too much ( not trying to be mean some people don't know how to drive a clutch at first). But I would more likely think it's in the clutch.