Possible Clues:

• Swimmer seen in large empty aquarium before game
• Fish in lake in the morning to get something caught?
• Innocent type almost a victim, a sucker to some
• Fish to batter victims
• Aquatic creature hit hard, animal killed by another
• Sucker giving millions to substituted player
• Beat victim, a sucker of sorts
• Freshwater eel-like fish
• Fish-like vertebrate
• Sucker punch on victim