A variety of brassica (8)
I believe the answer is:
broccoli
'a variety of brassica' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for broccoli that I've seen before include "Vegetable whose Italian name means 'sprouts'" , "Vegetable in a strange cool crib" , "Cubby --------, co-founder of the James Bond film franchise" , "Green vegetable - producer of Bond films" , "A hardy variety of cauliflower" .)