By way of, via (7)
I believe the answer is:
through
I believe this clue is a double definition.
'by way of' is the first definition.
(I've seen this before)
'via' is the second definition.
(I've seen this before)
(Other definitions for through that I've seen before include "Using" , "Per" , "As a result of" , "From one end or side to the other" , "By way of - exhausted" .)