The most common and most likely answer to this crossword clue is the 12 letter word COUNTERTENOR
I've seen this crossword clue in The Guardian
C
O
U
N
T
E
R
T
E
N
O
R
More clues leading to the result COUNTERTENOR
- Singer sounding note after the bar
- With money, we hear, thwart this singer
- Singer in bar, one over in centre of Montreux
- Voice said some cash is behind bar
- Singer with note heard at end of bar
- Voice conveying token meaning
- Vocalist drunk on recent tour
- Singer getting note say, below bar. No
- Singer anxious to return once
- Singer in bar given banknote, we hear
Buddy explains!
The straight part
We know that "Voice" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case voice = countertenor.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.
Crossword Answer definitions
COUNTERTENOR noun- Adult male singer who uses head tone or falsetto to sing far higher than the typical male vocal range
- Male singing voice far higher than the typical male vocal range
- (Older) a part or section performing a countermelody against the tenor or main part