Possible Clues:

• Shell out for wire after herd's stragglers escape
• Mollusc (shell used as money)
• Shell the beast first
• Farm animal that is eating river shellfish
• Marine gastropod with a shiny shell once used as money in some parts
• Mollusc shell
• Seashell used for leis
• Shelley, perhaps, had bits of the crow, that is to say