Possible Clues:

• Edible shellfish
• Start of serious term requiring work - one may be in one's shell
• Shellfish that's also plc
• For counsel there's nothing else but work for Shell
• Rings work, moving earliest of shifts - something fishy?
• Seafood
• Shapely dish in gown going around western state
• Edible shellfish with a pair of fan-shaped shells
• Summon 31 across inside the shell
• A shellfish