Possible Clues:

• One in the bleachers
• Flighty carrot-top pests that'll draw the crowds
• Observer's a weekly publication
• 'Observer' magazine
• Protects a doctor, for one, in the theatre
• 'Protect and Serve' initially confused witness
• One looks on
• 'The --', magazine edited by Boris Johnson from 1999 to 2005
• Boxing ace Prescott hit onlooker
• One watching a game could make a protest about clubs