The most common and most likely answer to this crossword clue is the 6 letter word CELERY
I've seen this crossword clue in Financial Times
C
E
L
E
R
Y
More clues leading to the result CELERY
- Plant needs IT installed for speed
- … in haste, leave it out a bit of salad
- Plant’s computer systems removed from dispatch
- Reportedly like the wine store’s sticky stuff?
- Vocal vendor introducing unknown vegetable
- Salad vegetable, mostly picked, over beside railway
- Unstable celebrity bit off some salad
- … hammered erectly, cutting close to root vegetable …
- Vegetable expedition lacks a certain something
- Express frustration about rotten leek, having thrown away last vegetable
Buddy explains!

The straight part
We know that "Plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plant = celery.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 CELERY mean?
CELERY noun- A European herb (Apium graveolens) of the carrot family.
- The stalks of this herb eaten as a vegetable.
- A yellow-green colour, like that of a celery.