Rush job? (6)
I believe the answer is:
career
This clue is a double definition.
'rush' is the first definition.
(career can mean to run or move out of control)
'job' is the second definition.
(someone's occupation)
(Other definitions for career that I've seen before include "Life's occupation" , "Lifetime's work" , "Not intellectual" , "Life (in terms of work etc)" , "job, but one that lasts for years?" .)