The most common and most likely answer to this crossword clue is the 7 letter word FLEURON
I've seen this crossword clue in The Times
F
L
E
U
R
O
N
Buddy explains!

The straight part
We know that "floral ornament" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case floral ornament = fleuron.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 FLEURON mean?
FLEURON noun- An ornament or knob in the shape of a flower
- The small flower at the centre of each side of a Corinthian abacus; a flos.
- The typographic element (❧), used as a punctuation mark or for decoration.