The most common and most likely answer to this crossword clue is the 6 letter word ARCING
I've seen this crossword clue in Financial Times
A
R
C
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 ARCING mean?
ARCING verb- To move following a curved path.
- To shape into an arc; to hold in the form of an arc.
- To form an electrical arc.
- The shape or motion of something that arcs.