Possible Clues:

• Brightly colored seashell
• Shell sometimes used as money
• Brightly marked seashell
• Cower about one and go into one's shell
• Shells of this marine mollusc have been used as money in some countries
• Shell once used as currency
• Shell used as South Pacific currency
• Sounds as if Shelley began as a beast
• Company that is full of conflict - not a Shell?
• Shell sometimes used as form of money