Rush into a profession (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)
'a profession' is the second definition.
(someone's profession is their career or occupation)
'into' acts as a link.
(Other definitions for career that I've seen before include "Run wildly" , "course securing professional employment" , "Rush headlong" , "Rush wildly" , "Lifetime's occupation" .)