[kdenlive] What does "save clip" exactly do?

[Harald Albrecht]

Hi,

after scratching my head all the time maybe someone on this list may 
chime in and hit me with a clue stick: what use case is Timeline>Current 
Clip>Save Clip intended for?

Is "save clip" a means to save just a region of a clip, yet complete 
with all effects applied to it? Saving it as an MLT playlist?

I tried to expand the resulting MLT playlist after dragging it into a 
fresh Kdenlive project. However, this doesn't work.

What would be the benefit of "save clip" compared to the library bin and 
its (more versatile) MLT playlists?

Best regards,
Harald