The most common and most likely answer to this crossword clue is the 6 letter word CHARDS
I've seen this crossword clue in The Times
C
H
A
R
D
S
Buddy explains!

The straight part
We know that "veg" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case veg = chards.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CHARDS mean?
CHARDS noun- An edible leafy vegetable, Beta vulgaris subsp. cicla, with a slightly bitter taste.
- Artichoke leaves and shoots, blanched to eat.