The most common and most likely answer to this crossword clue is the 8 plus 1 letter word REDCOAT} :
I've seen this crossword clue in The Daily Telegraph
R
E
D
C
O
A
T
}
:
Buddy explains!
The straight part
We know that "Camp entertainer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case camp entertainer = redcoat} :.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 REDCOAT} : mean?
REDCOAT} : noun- A British soldier, especially during the American Revolution.
- A member of the entertainment staff at Butlin's holiday camps in the United Kingdom, who wear red blazers.
- A fox.