Possible Clues:

• Shock, having revolution over fish
• In submarine, maybe, one who’s elected to conserve oxygen is a cold fish
• With bread, soak up fish dish
• Pickled herring to start followed by sponge
• Character told to clean fish fillet
• Fish product that's substandard turned up containing still more in the middle
• Spoken part doctor originally played? Something fishy here
• Raw pickled herring fillet
• Way for Pom to get some seafood?
• Pickled herring doctor's quietly taken with bread