Possible Clues:

• A male embodying unusually sour comic book creation
• Computer's back up here so corrupted in big screen saver?
• Comic character, wonderful Shakespearean role
• Her poseur (anag.)
• E.g. Batman
• Unusually gifted person having half-hearted meal with her circle
• Ruler in Orpheus disguised as Batman, say?
• Comic-strip character, perhaps getting petrol on her overalls initially
• Fantastic character turning round our sphere?
• Horse foolishly crossing river, after initially unseating poor equestrian, Captain America?