The most common and most likely answer to this crossword clue is the 8 letter word PRUNELLA
I've seen this crossword clue in The Guardian
P
R
U
N
E
L
L
A
More clues leading to the result PRUNELLA
- Dry fruit all over flower
- Perennial crop fully returned
- Silk fabric cut completely from the bottom
- Scales going up fully, needs to get trim on top
- Scales maybe overturned, all fruit on top
- Scales, perhaps, everything back after cut
- Old character in first half of play, the French girl
- Girl having fruit, totally upset
- Shape learners with a medicinal plant
- Cut back all around plant
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 = prunella.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 PRUNELLA mean?
PRUNELLA noun- A member of the genus Prunella of herbaceous plants, the allheals.
- Any of various diseases characterised by inflammation of the mouth or throat.
- A smooth worsted or silk fabric, generally black, formerly used for making shoes and clergymen's gowns.