Salad plant; reprimand (6)
I believe the answer is:
rocket
This clue is a double definition.
'salad plant' is the first definition.
(I've seen this before)
'reprimand' is the second definition.
(I've seen this before)
(Other definitions for rocket that I've seen before include "It's propelled to a great height by combustion" , "A slangy reprimand or a firework" , "Structure that flies by expelling gases - or a reprimand" , "Space missile" , "that should take off?" .)