Shoot up a locomotive (6)
I believe the answer is:
rocket
'shoot up' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for rocket that I've seen before include "Shoot upwards" , "Element in firework display" , "Edible plant; weapon" , "that should take off?" , "Space missile" .)