The most common and most likely answer to this crossword clue is the 8 letter word INTONING
I've seen this crossword clue in The Daily Telegraph
I
N
T
O
N
I
N
G
More clues leading to the result INTONING
Buddy explains!

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 INTONING mean?
INTONING verb- To give tone or variety of tone to; to vocalize.
- To utter with a musical or prolonged note or tone; to speak or recite with singing voice; to chant.
- To utter a tone; utter a protracted sound.
- Intonation