The most common and most likely answer to this crossword clue is the 4 letter word PLIÉ
I've seen this crossword clue in The Guardian
P
L
I
Ã
‰
More clues leading to the result PLIÉ
- Ballerina’s posture worked at steadily, endlessly
- Worked steadily, almost achieving graceful movement
- Rulebook: it’s learnt in ballet school
- Balletic action requires power — rest afterwards
- Confusion involving opening of legs in dance movement
- Irritating piles restricted movement on stage
- Tale following Pavlova’s first bend in a ballet
- Quietly rest dip while dancing
Buddy explains!

The straight part
We know that "Balletic action/Balletic action" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case balletic action/balletic action = pliÉ.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 PLIÉ mean?
PLIÉ noun- A smooth and continuous bending of the knees