Possible Clues:

• He's left the noisy rabble for a bad-tempered woman
• Fish in unknown quantity removed from Test
• Tasty fish, perhaps of rainbow kind
• Everybody in France eats river fish
• Pete Dexter's capital fish
• One might be caught on the fly
• What a fishy way not to be in the end
• Bull or Rainbow follower
• "Brook" fish
• Rainbow has red ring all can see