Possible Clues:

• 1980's-90's TV nickname
• Stock page listings: Abbr
• Funnyman Bill's nickname
• Prefix with play, at some cons
• A function that begins explanation informally?
• Company on small Greek island
• Trig calculation
• Leaves casually, for function
• The lettuce called romaine in North America
• Adjacent over hypotenuse, in trig