Possible Clues:

• In which one crew is a shade lighter than the other
• Stole horse strap in famous row
• Snake track - a challenge for Oxbridge types
• What a row this makes every year!
• Snake to detect in sports event
• Varsity Putney to Mortlake contest
• There's always a row where there's even a sign of a constrictor, perhaps, like this
• Stole track for sporting event
• The face of the Cockney - causing a big row
• A famous row