The most common and most likely answer to this crossword clue is the 7 letter word ALKANET
I've seen this crossword clue in Independent
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More clues leading to the result ALKANET
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 = alkanet.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 ALKANET mean?
ALKANET noun- Alkanna tinctoria, a plant whose root is used as a red dye.
- The dyeing matter extracted from the plant, giving a deep red colour.
- Other plants of the genus Alkanna.
- Anchusa officinalis (common bugloss), a similar plant.
- Anchusa ochroleuca (yellow alkanet).
- Anchusa barrelieri (false alkanet).
- Lithospermum arvense (bastard alkanet or field gromwell).
- Pentaglottis sempervirens (green alkanet), a blue-flowered plant with evergreen leaves.
- Puccoon (Sanguinaria canadensis).