The most common and most likely answer to this crossword clue is the 10 letter word BRANDISHED
I've seen this crossword clue in The Guardian
B
R
A
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D
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D
More clues leading to the result BRANDISHED
Buddy explains!

The straight part
We know that "flourished/flourished" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flourished/flourished = brandished.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 BRANDISHED mean?
BRANDISHED verb- To move or swing a weapon back and forth, particularly if demonstrating anger, threat or skill.
- To bear something with ostentatious show.