The most common and most likely answer to this crossword clue is the 6 letter word YARROW
I've seen this crossword clue in The Times
Y
A
R
R
O
W
More clues leading to the result YARROW
- Plant’s energy lost in time disturbance
- Raised concern about a plant
- Feel uneasy about importing a plant
- Pungent plant reflected sunlight on bank
- Frightful worry about a growth
- Concern about to mothball a plant
- Herb’s chromosome indicator
- Flipping badger eating root of brassica plant
- Pest climbing around a plant
- Plant needed to put new facade on school
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 = yarrow.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 YARROW mean?
YARROW noun- Any of several pungent Eurasian and North American herbs, of the genus Achillea, used in traditional herbal medicine.
- Common yarrow, Achillea millefolium, the type species of the genus.
- The green woodpecker, Picus viridis.