Crossword Genius

First steam locomotive (6)

Ross

I believe the answer is:

rocket

(Other definitions for rocket that I've seen before include "Cruciferous salad plant" , "Salad plant - shoot up" , "Aerial projectile" , "Projectile firework" , "It is used to propel a spacecraft or missile" .)

I've seen this clue in the Sydney Morning Herald.
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