The most common and most likely answer to this crossword clue is the 9 letter word CHORISTER
I've seen this crossword clue in The Daily Telegraph
C
H
O
R
I
S
T
E
R
More clues leading to the result CHORISTER
- Cutting 500 smash hit records for singer
- Rhetoric’s put off singer
- Short job with no enjoyment tires out singer
- Singer his rector trained
- Singer his rector trained?
- Singer‘s hit – score rearranged by producer, ultimately
- One who sings Bach, or is terrific indoors
- Awful wretch Boris heads off to be a singer
- Getting round in, S. Richter ordered a treble, perhaps
- Singer, or first to interrupt singer
Buddy explains!

The straight part
We know that "singer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case singer = chorister.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 CHORISTER mean?
CHORISTER noun- A singer in a choir.
- A director or leader of a choral group.