Organise a ladder (3)
I believe the answer is:
run
I believe this clue is a double definition.
'organise' is the first definition.
(both can mean to lead or be in charge of)
'a ladder' is the second definition.
(both can mean a tear in tights)
(Other definitions for run that I've seen before include "follow a course" , "Flow; function" , "politician must do this to get elected" , "Move at speed" , "string of performances" .)