Running; leaving (5)
I believe the answer is:
going
I believe this clue is a double definition.
'running' is the first definition.
('go' can be a synonym of 'run')
'leaving' is the second definition.
(synonyms)
(Other definitions for going that I've seen before include "repeated as sale nears completion" , "Condition, of course" , "Moving away, departing" , "Ground condition for horse racing" , "Progress" .)