The most common and most likely answer to this crossword clue is the 5 plus 4 letter word CLASS ACTS
I've seen this crossword clue in Financial Times
C
L
A
S
S
A
C
T
S
More clues leading to the result CLASS ACTS
Buddy explains!
The straight part
We know that "groups with great style and skill" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case groups with great style and skill = class acts.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.