Reportedly beginning journey (5)
I believe the answer is:
route
'journey' is the definition.
(I've seen this in other clues)
'reportedly beginning' is the wordplay.
'reportedly' shows a homophone (sound like).
'beginning' becomes 'root' (synonyms).
'root' sounds like 'ROUTE'.
(Other definitions for route that I've seen before include "Direction of travel" , "Course to destination" , "Itinerary; way" , "Way of getting from A to B" , "Way travelled" .)