Way of parking at hospital (4)
I believe the answer is:
path
'way' is the definition.
(path is a kind of way)
'parking at hospital' is the wordplay.
'parking' becomes 'p'.
'hospital' becomes 'h'.
'p'+'at'+'h'='PATH'
'of' is the link.
(Other definitions for path that I've seen before include "Bridleway" , "Route, course" , "trail" , "Pedestrian way" , "Track; direction" .)