The most common and most likely answer to this crossword clue is the 10 letter word PRONOUNCES
I've seen this crossword clue in Financial Times
P
R
O
N
O
U
N
C
E
S
Buddy explains!

The straight part
We know that "Voices" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case voices = pronounces.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
PRONOUNCES verb- To declare formally, officially or ceremoniously.
- To declare authoritatively, or as a formal expert opinion.
- To pass judgment.
- To sound out (a word or phrase); to articulate.
- To produce the components of speech.
- To read aloud.