The most common and most likely answer to this crossword clue is the 7 letter word ANEMONE
I've seen this crossword clue in The Times
A
N
E
M
O
N
E
More clues leading to the result ANEMONE
- Plant, one no men adored, partly rejected
- Bizarre name associated with a solitary flower
- Something flowery one man replanted to cover middle of bed
- Chaps upset, caught in a single bloomer
- Bloomer made by a submariner on new dive finally
- Individual after different name for plant
- Flower exhibited in phenomenal retrospective
- Exotic name taken by singular plant
- Individual taking new name first
- A bit upset in phenonemenal bloomer
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 = anemone.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 ANEMONE mean?
ANEMONE noun- Any plant of the genus Anemone, of the Ranunculaceae (or buttercup) family, such as the windflower.
- A sea anemone.