User blog comment:Neowitch/664 - Exposure and Exposition/@comment-3125914-20120418140155/@comment-79.136.17.129-20120418144117

You are right, he did call someone Joker, it was the person he just got off the den den mushi with.

http://www.mangareader.net/one-piece/664/7

This Joker guy is most likely someone above Clown since the latter said "we got permission to kill".