The most common and most likely answer to this crossword clue is the 11 letter word INTERVENING
I've seen this crossword clue in The Times
I
N
T
E
R
V
E
N
I
N
G
Buddy explains!

The straight part
We know that "Interrupting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case interrupting = intervening.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 INTERVENING mean?
INTERVENING verb- To become involved in a situation, so as to alter or prevent an action.
- To occur, fall, or come between, points of time, or events.
- To occur or act as an obstacle or delay.
- To say (something) in the middle of a conversation or discussion between other people, or to respond to a situation involving other people.
- To come between, or to be between, persons or things.
- In a suit to which one has not been made a party, to put forward a defense of one's interest in the subject matter.
- Intervention; mediation
- That intervenes or mediates.
- Falling between two periods or events.