The most common and most likely answer to this crossword clue is the 7 letter word MANTRAS
I've seen this crossword clue in The Daily Telegraph
M
A
N
T
R
A
S
Buddy explains!
The straight part
We know that "Special utterances" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case special utterances = mantras.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 MANTRAS mean?
MANTRAS noun- The hymn portions of the Vedas; any passage of these used as a prayer.
- (originally Hinduism) A phrase repeated to assist concentration during meditation.
- (by extension) A slogan or phrase often repeated.