Clarus is a star system, a trinary star located in the space of the galaxy's Alpha Quadrant, in the vicinity of Ferenginar, Irtok and Epsilon Cygni. This trinary consists of a type K orange star as its primary, a type G yellow star as its secondary, and a type M red star as its tertiary. (ST reference: Star Charts)

In 2374, Kira Nerys told Quark and Rom that if the Dominion had plans to invade Ferenginar, they would conquer Clarus first before moving on to the capital of the Ferengi Alliance. (DS9 episode: "Profit and Lace")

In 2376, an Orion transport brought Quark and Ro Laren to the Clarus system and then through an Iconian Gateway to Farius Prime. Quark, Ro, Treir and Ychell Mafon later used a Bajoran Militia flitter to escape the Orion Syndicate through the gateway back to the Clarus system. (DS9 - Gateways novel: Demons of Air and Darkness)