Vitamin found in sugary cut vegetable (5)
I believe the answer is:
swede
'vegetable' is the definition.
(I know that swede is a type of cruciferous vegetable)
'vitamin found in sugary cut' is the wordplay.
'vitamin' becomes 'd' (D is an example).
'found in' is an insertion indicator.
'sugary' becomes 'sweet' (similar in meaning).
'cut' means to remove the last letter.
'sweet' with its final letter taken off is 'swee'.
'd' placed inside 'swee' is 'SWEDE'.
(Other definitions for swede that I've seen before include "Scandinavian - vegetable" , "Person like Strindberg" , "Large root vegetable" , "Native of Stockholm" , "A turnip, or a Scandinavian" .)