The most common and most likely answer to this crossword clue is the 5 plus 7 letter word GO-GO DANCERS
I've seen this crossword clue in The Guardian
G
O
-
G
O
D
A
N
C
E
R
S
Buddy explains!
The straight part
We know that "Late-night “entertainers”" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case late-night “entertainers” = go-go dancers.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.