I was fooling around and I decided to search for a clue…
dclarke@ubuntu-image:~$ apt-cache search clue
bughelper - bugsquad's utility for Launchpad
cl-clue - Lisp package for clue/clio/pictures: X interfaces for lisp
clisp - GNU CLISP, a Common Lisp implementation
clue - Package to ease upgrading, delete me
gfpoken - Recreate a grid of mirrors from clues given by tests
hybrid-dev - development files for ircd-hybrid
spamassassin-rules-ja - Japanese filter rules for spamassassin
Yep, there it is…