The crossword solution for the term 'Bribe for Cerberus' is SOP. SOP stands for Standard Operating Procedure, which is a set of instructions that outlines how a task should be completed. It is often used in business and government settings to ensure that tasks are completed in a consistent manner. In this case, the SOP would be the bribe given to Cerberus, the three-headed dog from Greek mythology who guards the entrance to the underworld.