The most common and most likely answer to this crossword clue is the 2 plus 5 letter word ON STAGE
I've seen this crossword clue in The Times
O
N
S
T
A
G
E
More clues leading to the result ON STAGE
- Performing with two legs
- Appearing in musical, perhaps men only in first number
- Speculative buyer introduced to United players here?
- Ring agents about acting
- Production of Agonistes – is cast visible to the audience?
- Figure punched by male, playing a part?
- Two legs — where to break one?
- Performing animal put inside one
- Person claiming stock exchange trader is prepared to act
- Performing male only seen inside one
Buddy explains!

The straight part
We know that "Performing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case performing = on stage.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 ON STAGE mean?
ON STAGE adjective- On the part of a stage that is visible to the audience.
- Taking place on the part of a stage that is visible to the audience.