The most common and most likely answer to this crossword clue is the 6 letter word TENORS
T
E
N
O
R
S
Buddy explains!

The straight part
We know that "singers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case singers = tenors.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 TENORS mean?
TENORS noun- A musical range or section higher than bass and lower than alto.
- A person, instrument or group that performs in the tenor (higher than bass and lower than alto) range.
- A musical part or section that holds or performs the main melody, as opposed to the contratenor bassus and contratenor altus, who perform countermelodies.
- The lowest tuned in a ring of bells.
- Tone, as of a conversation.
- Duration; continuance; a state of holding on in a continuous course; general tendency; career.
- The subject in a metaphor to which attributes are ascribed.
- Time to maturity of a bond.
- Stamp; character; nature.
- An exact copy of a writing, set forth in the words and figures of it. It differs from purport, which is only the substance or general import of the instrument.
- That course of thought which holds on through a discourse; the general drift or course of thought; purport; intent; meaning; understanding.
- A tenor saxophone.