Yranac

From Memory Alpha, the free Star Trek reference.

Yranac was a Yridian information dealer, who spent some time doing business on the planet Dessica II in the late 2360s.

In 2370, he witnessed what he thought was Captain Jean-Luc Picard being vaporized with a disruptor in a local bar. Just as Yranac, for a price, was about to talk to William Riker who was investigating Picard's disappearance, the bartender grabbed him and told him that he had too much to drink and should keep quiet. Riker learned from Yranac that the alleged murderers had moved on to the Barradas system.(TNG: "Gambit, Part I")

Yranac was played by Alan Altshuld. The name Yranac is a reversal of Canary, a popular name for someone who provides information.