Possible Clues:

• Tuna in foil, newly prepared
• One from school's cowardly if climbing on back of dolphin
• React to pain, perhaps, failing to complete delicate catch
• Shout cry of pain, with half of finger taken away in big fish
• Fish remarkably few? Only one left
• A tuna in foil, newly cooked
• Pinning down finely cooked tuna
• Cowardly end in Cannes?
• Shout now, if that is flaky tuna