The most common and most likely answer to this crossword clue is the 6 letter word TURNIP
I've seen this crossword clue in The Sunday Telegraph
T
U
R
N
I
P
More clues leading to the result TURNIP
- Convert smallest amount for vegetable
- Root Internet Protocol under change of direction
- Watch performer cutting remark when Queen’s absent
- Useful hint about container for boiling vegetable
- Advice about vessel for Swede perhaps
- Become religious after knocking over veggie
- Vegetable container shown in list
- Puritan zealously rejected a root crop
- Vegetable pot in recommendation
- Track back and pinch vegetable
Buddy explains!

The straight part
We know that "Vegetable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vegetable = turnip.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 TURNIP mean?
TURNIP noun- The white root of a yellow-flowered plant, Brassica rapa, grown as a vegetable and as fodder for cattle.
- The yellow root of a related plant, the swede or Brassica napus.
- A large, heavy pocket watch, so called because its profile resembled the vegetable.
- To plant with turnips.
- To feed or graze (livestock) on turnips.