The most common and most likely answer to this crossword clue is the 8 letter word TRILLING
I've seen this crossword clue in The Daily Telegraph
T
R
I
L
L
I
N
G
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 TRILLING mean?
TRILLING verb- To create a trill sound; to utter trills or a trill; to play or sing in tremulous vibrations of sound; to have a trembling sound; to quaver.
- To impart the quality of a trill to; to utter as, or with, a trill.
- To trickle.
- To twirl.
- The production of a trill sound.
- A compound crystal consisting of three individuals.
- One of three children born at the same birth; a triplet.