nibhelim,
By the pricking of my thumbs you have one or more Clipping Masks and wish to get rid of the hidden parts of imges that are outside them.
You can do the dirty destructive deed, with the/each Clipping Mask selected, exact way depending on version, step 1) only needed in old versions:
1) In the Transparency palette/panel dropdown list select anything but Normal (Multiply is fine); this step is undoubtedly unneeded in your version, you may try without it;
2) Object/Edit>Flatten Transparency, just keep the defaults including 100% Vector;
3) Shudder (optional, unless unavoidable).
This will crop everything to the Clipping Path, so everything outside is actually gone, but a raster image can only be rectangular regardless of where/how it is created so it will have
transparency/emptiness to fill its Bounding Box which corresponds to that of the Clipping Mask/Path.