The most common and most likely answer to this crossword clue is the 9 letter word MANGETOUT
I've seen this crossword clue in The Sunday Telegraph
M
A
N
G
E
T
O
U
T
More clues leading to the result MANGETOUT
- Type of pea is island produce
- Staff instruction to leave something on plate
- Starter in mess with an excuse for a vegetable
- … guy has a way to avoid legume
- For heaven’s sake go away and find something to eat
- Staff leave vegetables
- Vegetable chap has to leave
- Vegetable extract on hand
- Vegetable extract crushed by hand
- Fellow on leave is climber
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 = mangetout.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 MANGETOUT mean?
MANGETOUT noun- A vegetable pea (Pisum sativum) eaten when immature.