The most common and most likely answer to this crossword clue is the 7 letter word LETTUCE
I've seen this crossword clue in Independent
L
E
T
T
U
C
E
More clues leading to the result LETTUCE
- Playing lute etc in Cos?
- Large ship almost capsized touching eastern iceberg, perhaps
- Vegetable cutlet prepared with pea, essentially
- Old-fashioned Latvian regularly mulches plant
- Leaves you muttering in old Latvian church
- Vegetable knife cut tell-tale rejected outside leaves
- Harvest festival item maybe allowed by brothers linked to church
- Green food found by organised workers during the summer in France
- Leaves service with rake-off to return east
- Leaves to dress for dinner
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 = lettuce.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 LETTUCE mean?
LETTUCE noun- An edible plant, Lactuca sativa and its close relatives, having a head of green and/or purple leaves.
- The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc.
- United States paper currency; dollars.
- A strong yellow-green colour, like that of lettuce (also called lettuce green).