### Clue: Accidentally leak article on runners? (5,3,5)
### Answer: SPILL THE BEANS 
 ### Explanation: Definition: Accidentally leak
 SPILL(leak liquid from out of a container) + THE(article in grammar) **placed above**(on, in a down clue) BEANS(I presume "runners" is a reference to runner beans).
"leak" is doing double duty.