The most common and most likely answer to this crossword clue is the 11 letter word EVENTLES[S]
E
V
E
N
T
L
E
S
[
S
]
Buddy explains!
The straight part
We know that "with nothing happening" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with nothing happening = eventles[s].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.