The most common and most likely answer to this crossword clue is the 8 letter word EVENTFUL
I've seen this crossword clue in The Guardian
E
V
E
N
T
F
U
L
More clues leading to the result EVENTFUL
- Busy outlet that reordered fuel cans
- Exciting item in sports programme for unfit layabouts originally
- Busy outlet stops fuel distribution
- Memorable description of the Olympics?
- Exciting to sound off about fuel crisis? Contrariwise
- Momentous exhibition’s first opening, almost filled to capacity
- Flue lining damaged flue filled with stuff
- Returning full-time university student’s after flat with lots going on
- Unusually busy outlet blocking production of fuel
- Busy express with external flue broken
Buddy explains!

The straight part
We know that "lots going on" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lots going on = eventful.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 EVENTFUL mean?
EVENTFUL adjective- Of or pertaining to high levels of activity; having many memorable events.