The most common and most likely answer to this crossword clue is the 8 letter word SNEEZING
I've seen this crossword clue in The Daily Telegraph
S
N
E
E
Z
I
N
G
More clues leading to the result SNEEZING
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 SNEEZING mean?
SNEEZING verb- To expel air as a reflex induced by an irritation in the nose.
- To expel air as if the nose were irritated.
- The act of producing a sneeze.