Possible Clues:

• Rainbow, for example, seen in Waterloo, south of West End
• Salmon-like fish
• It has been known to be tickled to death
• Performance by five players in West End debacle
• Fish from river in market
• To be so fishy is to end in defeat
• Time before river revealed fish
• Experiment with missing unknown: one may be hooked
• Move quickly round university, finding something to eat
• Fly catcher?