Possible Clues:

• So to polish your image is enough to make you cross
• So to polish one's image makes one cross
• Does it make one cross to polish one's image like this?
• Its crossing irrevocable
• Caesar crossed this river in an irreversible step
• Polish your image and cross it decisively
• Clean up image - a term used in 12
• It's enough to make one cross to polish one's image
• River, its crossing decisive
• Point of no return for rugger idol grabbing ball at outset