Shoot up salad plant (6)
I believe the answer is:
rocket
This clue is a double definition.
'shoot up' is the first definition.
(thesaurus)
'salad plant' is the second definition.
(I've seen this before)
(Other definitions for rocket that I've seen before include "Self-propelled firework or missile" , "that should take off?" , "Shoot upwards" , "Projectile, missile" , "Firework - sharp lecture" .)