The most common and most likely answer to this crossword clue is the 8 letter word MINSTREL
I've seen this crossword clue in The Daily Telegraph
M
I
N
S
T
R
E
L
More clues leading to the result MINSTREL
- Joint inspiring new songs primarily, left for old musician
- He serenades Poles in joint with learner
- Plucky airman of a bygone age?
- Old musician, male in street on left
- Musician Mike strangely silent around king
- Troubadour Mrs let in, unwisely
- … troubadour in street protected by Merlin somehow
- Minute on street regarding line to see old musician
- Terminals planned with no area for an entertainer
- Singer extravagantly rents limo to drop round
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 = minstrel.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 MINSTREL mean?
MINSTREL noun- A medieval traveling entertainer who would sing and recite poetry, often to his own musical accompaniment.
- One of a troupe of entertainers who wore black makeup (blackface) to present a so-called minstrel show, being a variety show of song, dance and banjo music.