The most common and most likely answer to this crossword clue is the 8 letter word FRISKING
I've seen this crossword clue in The Times
F
R
I
S
K
I
N
G
More clues leading to the result FRISKING
Buddy explains!

The straight part
We know that "prancing about" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case prancing about = frisking.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 FRISKING mean?
FRISKING verb- To frolic, gambol, skip, dance, leap.
- To search somebody by feeling his or her body and clothing.
- The action or motion of one who frisks; a gambol.