The most common and most likely answer to this crossword clue is the 5 letter word CHARD
I've seen this crossword clue in Financial Times
C
H
A
R
D
More clues leading to the result CHARD
- Somerset town Conservative? Not easily penetrated
- Vegetable, cold and tough
- Vegetable left too long on the barbecue, did you say?
- Vegetable is cold and tough
- About having an erection, which might be pulled in the vegetable garden
- Vegetable ending in salad behind fish
- Veg is cold and tough
- Grill German veggie
- Finally found beneath tea leaves
- Cold, frozen vegetable
Buddy explains!

The straight part
We know that "veggie" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case veggie = chard.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 CHARD mean?
CHARD noun- An edible leafy vegetable, Beta vulgaris subsp. cicla, with a slightly bitter taste.
- Artichoke leaves and shoots, blanched to eat.