You would use this to mean something went great or someone made a tremendous effort at something for a period of time (that has now ended)
Like, "When he first opened the restaurant, he had a real go, but then the business failed"
March 11, 2018
"Having a real go" implies putting a real effort to doing or achieving something. When used in the past sense though, it often signifies that the effort wasn't enough. "Had a real go" can often be seen in sports reporting, where an underdog was able to upset or challenge a better opponent, only to lose in the end.