/usr/share/doc/clang-tidy-3.7/NEWS.Debian.gz is in clang-tidy-3.7 1:3.7.1-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/clang-tidy-3.7/../libllvm3.7/NEWS.Debian.gz
/usr/share/doc/clang-tidy-3.7/../libllvm3.7/NEWS.Debian.gz