Recently on a ramp in a parking structure I messed up when trying to accelerate again from a standstill by not letting the clutch out far enough and bringing the engine to way too high rpms (may have been around 4k). Afterwards a burning-kind of smell lingered for a minute or so, which I presume came from the clutch which got hotter than it should normally be.
Now, how harmful was this to the clutch? It happened once and I didn't notice any difference in behaviour afterwards. The smell also vanished and didn't persist.