The most common and most likely answer to this crossword clue is the 9 letter word GYMNASTIC
I've seen this crossword clue in The Daily Telegraph
G
Y
M
N
A
S
T
I
C
More clues leading to the result GYMNASTIC
- My acting's pulled apart as sort of vigorous
- My acting’s odd, but vigorous
- Involved in bar work, say, we hear James can sit around
- My acting’s fresh and vigorous
- My acting’s absurdly acrobatic
- My acting’s awfully athletic
- Mystic nag performs acrobatics
- Agile of me to get back into machined casting
- Like Nadia or Olga, my acting's affected
Buddy explains!

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 GYMNASTIC mean?
GYMNASTIC noun- A gymnast.
- Pertaining to gymnastics.
- Pertaining to the gymnasia (ancient Greek schools).