The most common and most likely answer to this crossword clue is the 8 letter word HYACINTH
I've seen this crossword clue in Financial Times
H
Y
A
C
I
N
T
H
More clues leading to the result HYACINTH
- Flower advice includes short chat by leading horticulturalist
- It’s a bloomer to rent electronic instrument, some might say
- Flower husband presented to poorly Cynthia
- Flower child’s second in yacht to be replaced
- Bill is enthralled by extremely hardy and unusually thin flower
- Bucket perhaps for flowering plant
- Cynthia watered husband's plant
Buddy explains!

The straight part
We know that "Flower" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flower = hyacinth.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 HYACINTH mean?
HYACINTH noun- Any bulbous plant of the genus Hyacinthus, native to the Mediterranean and South Africa.
- A variety of zircon, ranging in color from brown, orange, reddish-brown and yellow; a jacinth.