Clarus
Clarus was a star system in the Alpha Quadrant, one of several surrounding systems of Ferenginar. 

In 2371, the location of the Clarus system was labeled in the star chart Data and Picard were studying in stellar cartography aboard the . (, okudagram)

When, in 2374, Rom floated the possibility that the Dominion had conquered Ferenginar, Major Kira Nerys countered that it could not have been taken without first conquering systems like Clarus and Irtok. ()

In 2399, the location of Clarus was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in or near Ferengi space. ()

Appendices

Background information 
According to Star Trek: Star Charts ("United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Clarus system was a trinary system with a K-class star, a G-class star, and a M-class star. In the late 24th century, it was an independent system.

Another very similarly named system, the Clarius system, was also associated with the Ferengi.

The  identified Arcybite as a planet in this system and located the system near Ferenginar.

According to StarTrek.com, the system's primary was named Clarus.

External link 
 

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Star systems