Who is Clip Arnstein from Fade Away and what is their importance?

The owner of the New Jersey Dragons, Clip hires Myron to find the team's missing star, Greg Downing. Clip had drafted Myron and Greg when they were in college and feels a sense of responsibility for both men. Though Arnstein tells Myron very little at first, he does supply more information when Myron questions him. Arnstein is aware of the blackmailers and what they have against Greg, but does not see any other way to let Myron know the truth about his injury ten years ago.