The most common and most likely answer to this crossword clue is the 8 letter word FLOURISH
F
L
O
U
R
I
S
H
More clues leading to the result FLOURISH
- Blossom like white powder?
- Display a frown when tucking into seafood
- Display angry look when tucking into seafood
- Prosper and show off
- Succeed, like something powdery?
- Do very well where main ingredient in bread is heroin
- Wave from student about teatime approximately? Quite the reverse
- School member admits dirty look and gesture
- Rather like meal to be a success
- Wave, seeing learner parting around teatime?
Buddy explains!

The straight part
We know that "Wax" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wax = flourish.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 FLOURISH mean?
FLOURISH noun- A dramatic gesture such as the waving of a flag.
- An ornamentation.
- A ceremonious passage such as a fanfare.
- A decorative embellishment on a building.
- To thrive or grow well.
- To prosper or fare well.
- To be in a period of greatest influence.
- To develop; to make thrive; to expand.
- To make bold, sweeping movements with.
- To make bold and sweeping, fanciful, or wanton movements, by way of ornament, parade, bravado, etc.; to play with fantastic and irregular motion.
- To use florid language; to indulge in rhetorical figures and lofty expressions.
- To make ornamental strokes with the pen; to write graceful, decorative figures.
- To adorn with beautiful figures or rhetoric; to ornament with anything showy; to embellish.
- To execute an irregular or fanciful strain of music, by way of ornament or prelude.
- To boast; to vaunt; to brag.