Last stand (6)
I believe this is a double definition.
'last' is the first definition.
(running is a kind of lasting)
'stand' is the second definition.
(I've seen this before)
(Other definitions for run that I've seen before include "A single" , "Dash" , "Enter a race" , "Path made by animals" , "Take flight" .)
(Other definitions for endure that I've seen before include "Undergo a tough time" , "Last or bear with courage" , "Last or suffer patiently" , "Abide" , "'Last, bear (6)'" .)