Created attachment 109124 [details]
Example file with clipping
Cairo ignores the clip path. Example file attached.
%%BoundingBox: 0 0 595 842
%%HiResBoundingBox: 0 0 595 842
%%Title: GMT v5.2.0_r13668 [MP] Document from psbasemap
You've attached a PostScript file created by GMT. I'm not sure what the cairo bug is or how to reproduce it.