Not even super finished this vegetable (6)
I believe the answer is:
sprout
'this vegetable' is the definition.
(sprout is a type of vegetable)
'not even super finished' is the wordplay.
'not even' means one should take alternating letters (remove even-numbered letters).
'finished' becomes 'out' ('I'm out' means 'I'm finished').
The alternating letters of 'super' are 'spr'.
'spr'+'out'='SPROUT'
(Other definitions for sprout that I've seen before include "Produce buds" , "Develop new growth" , "something for Christmas dinner?" , "Begin to develop" , "Grow like Proust" .)