### Clue: Sky feature about Irish sport succeeded (6)
### Answer: CIRRUS 
 ### Explanation: Definition: Sky feature
 C(abbrev. for "circa"/about when refering to years or time periods) + IR(abbrev. for "Irish") + RU(abbrev. for the sport of Rugby Union) + S(abbrev. for "succeeded").
Defn: …, specifically, a form of clouds.