The most common and most likely answer to this crossword clue is the 7 letter word SHOWIER
S
H
O
W
I
E
R
More clues leading to the result SHOWIER
Buddy explains!

The straight part
We know that "more flamboyant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more flamboyant = showier.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 SHOWIER mean?
SHOWIER adjective- (sometimes derogatory) calling attention; flashy; standing out to the eye