The most common and most likely answer to this crossword clue is the 7 letter word PRIMULA
I've seen this crossword clue in The Times
P
R
I
M
U
L
A
More clues leading to the result PRIMULA
- Back I run into a swelling flower
- Correct, evenly placed components in nuclear plant
- Bloomer made by union leader in stiffly formal city
- Bloom in Los Angeles after 11:20?
- Early growth developed in Lima, Peru — not Spain
- Mixed up marl I needed for plant
- Flower border acceptable in detailed design
- Cheese plant?
- Proper, upper-class jacket of Lycra is ornamental
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 = primula.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 PRIMULA mean?
PRIMULA noun- Any plant of the genus Primula; the primroses.