I have a great amount of figures with the same properties and I would like to crop them all in the same way.
Is there a faster way to do it in Inkscape instead of doing it one by one?
At least in Inkscape 0.91 r (May 20 2016), I could directly set one clip on multiple objects. Setting the clip worked for vector and raster image objects at the same time.
Object > Clip > Set. The topmost object should be used as a clip for each object below.
The image below shows the scene before (top left) and after (bottom left) clipping. The black object was used for clipping. For clarity, the right-hand side shows the objects in the background.