The most common and most likely answer to this crossword clue is the 5 letter word LUPIN
I've seen this crossword clue in Financial Times
L
U
P
I
N
More clues leading to the result LUPIN
- Stick supporting middle of blue flower
- Flower of Wolves cut
- Bloomer at university, interrupting endless row
- Learner at university in bloomer
- From what we hear, toilet fastener is something flowery
- Short wolfish one maybe found in bed
- Flower in prominent position? Nothing revolutionary about that
- Ladies under pressure at first in plant
- Plant goin’ into coiled shape by the sound of it
- In vexation I pull up 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 = lupin.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 LUPIN mean?
LUPIN noun- Any member of the genus Lupinus in the family Fabaceae.
- A lupin bean, a yellow legume seed of a Lupinus plant (usually Lupinus luteus), used as feed for sheep and cattle and commonly eaten in the Mediterranean area and in Latin America although toxic if prepared improperly.