The most common and most likely answer to this crossword clue is the 4 plus 4 plus 7 letter word DAME EDNA EVERAGE
D
A
M
E
E
D
N
A
E
V
E
R
A
G
E
More clues leading to the result DAME EDNA EVERAGE
Buddy explains!
The straight part
We know that "entertainer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case entertainer = dame edna everage.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.