Send away for a job (4)
I believe the answer is:
post
I believe this clue is a double definition.
'send away' is the first definition.
(thesaurus)
'a job' is the second definition.
(post is a kind of job)
'for' is the link.
(Other definitions for post that I've seen before include "delivery" , "Job - letters - stake in ground" , "Pole - position" , "A column" , "Position; mail" .)