Style of direction (3)
I believe the answer is:
way
I believe this is a double definition.
'style' is the first definition.
('way' can be a synonym of 'style')
'direction' is the second definition.
('way' can be a synonym of 'direction')
'of' is the link.
(Other definitions for way that I've seen before include "Route; direction" , "'Manner, mode (3)'" , "Method; route" , "Street" , "Manner; road" .)