Desert Storm missile (4)
'desert storm 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 "(Of clouds) move quickly" , "Run fast (as before a gale)" , "Gulf war missile" , "Traverse swiftly" , "Move fast (like a cloud?)" .)
(Other definitions for seed that I've seen before include "Pip; tennis player" , "What is sown" , "One of the outstanding players in a tournament" , "Kernel" , "Pip for sowing" .)