She is the patron saint of eyes, television, television writers, telephones, gliders, gold workers, goldsmiths, laundry and needle workers, telegraphs, and more. Her symbols are a monstrance or pyx, objects of which she often held.
St. Clare's most famous miracle took place one day in Assisi. A group of soldiers came to attack the city, Clare went outside of the Church where her order took place and placed a blessed sacrament upon the wall and prayed. The soldiers then headed back, causing no harm to Assisi and its people. (Catholic Online)