The phrase "former referee" means a person who used to be an official in a sports game or competition but is not currently doing that job anymore. Full definition
Pundits from the journalism world, as well as former Referee Howard Webb, have previously stated that Arsenal have lost their aggression under Wenger in recent years, but perhaps now things are slowly changing back to the ways they were in the old days. (justarsenal.com)
The NBA most recently deal with the fallout of former referee Tim Donaghy, who pleaded guilty to charges related to calls made in games that help make a point spread for gamblers. (nystateofpolitics.com)
Many believe Game 6 was one of the games former referee Tim Donaghy was referring to when he alleged improper officiating during his trial in 2008, although a review set up by the league couldn't find evidence the game was actually fixed. (sbnation.com)