Firework in the salad? (6)
I believe the answer is:
rocket
This clue is a double definition.
'firework' is the first definition.
(I know that rocket is a type of firework)
'salad?' is the second definition.
(I know that rocket is a type of salad)
'in the' is the link.
(Other definitions for rocket that I've seen before include "Aerial projectile" , "go fast" , "Self-propelled missile and a plant" , "Firework and lettuce" , "Severe criticism" .)