Possible Clues:

• Half the competitors with an obsession about doing well
• Right quartet in article doing well
• Growing obsession about heads of royalty in view
• Full-bodied Bordeaux, say, swells uneasy girth
• Blooming obsession that's absorbing Rex, four
• Doing very well
• Successful head of Radio 4 covered by article
• The object is to keep stretch of river prosperous