Possible Clues:

• Capital investment in company with rising sense of purpose
• Crown, gold, unique, shown in court
• Crown court imprisoning alternative individual
• Crown court not acceptable detaining one
• Peer's headgear
• Headgear made of gold, one seen in court
• It might go to one's head, finding ring covered in ice-cream
• Royal band
• Jewelled headgear for peer
• Jewelled circlet for the head