Vocation involving door-to-door work? (7)
I believe the answer is:
calling
This clue could be a double definition.
'vocation' is the first definition.
(synonyms)
'door-to-door work?' is the second definition.
'calling' can be an answer for 'work?' (someone's career or vocation). I am not sure about the 'door-to-door' bit.
'involving' is the link.
Can you help me to learn more?
(Other definitions for calling that I've seen before include "Vocation or profession" , "Ringing" , "Running a bingo game" , "visiting" , "Occupation" .)