/usr/lib/x86_64-linux-gnu/libclutter-gtk-1.0.so is in libclutter-gtk-1.0-dev 1.8.4-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libclutter-gtk-1.0.so.0.800.4
/usr/lib/x86_64-linux-gnu/libclutter-gtk-1.0.so.0.800.4