Gulf War missile (4)
I believe the answer is:
scud
'gulf war missile' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scud that I've seen before include "Move along smoothly - run before gale - Russian missile" , "(Of a cloud) move very quickly" , "Ballistic missile; sweep along" , "fly" , "Move fast, missile" .)