Possible Clues:

• It helps create a capital
• Period of work is fundamental - it'll change the capital
• *Capital letter creator
• Spell of work crucial as way to get capital
• Period of work crucial - it produces capital
• Press it to type capitals
• One's depressed to find another case
• Change solution found on typewriter
• It's pressed while making THIS
• One pressed to find capital, not to be trusted touring half of Kent