Wernher von Braun's field (8)
I believe the answer is:
rocketry
'wernher von braun's field' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rocketry that I've seen before include "Branch specialised in launching" , "Modern technology" , "Clever science" , "Complex science" , "Powerful science" .)