The job of a door-to-door salesman? (7)
I believe the answer is:
calling
'the job' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for calling that I've seen before include "Occupation" , "Predicting the outcome" , "Urge to follow a particular career" , "Running a bingo game" , "Vocation or profession" .)