The most common and most likely answer to this crossword clue is the 9 letter word EXPLOSION
I've seen this crossword clue in The Guardian
E
X
P
L
O
S
I
O
N
More clues leading to the result EXPLOSION
- Working to support former US Speaker giving up ecstasy, blow
- Former No.1, first of singles on album reviewed in report
- Sudden increase in time in which oxlips flourish
- Explore with passion without spare parts – it could be a blast
- Blast! Former PLO staffer is operating nightclub, for starters
- Kinky sex in pool is a blast
Buddy explains!
The straight part
We know that "Sudden increase" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sudden increase = explosion.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 EXPLOSION mean?
EXPLOSION noun- A violent release of energy (sometimes mechanical, nuclear, or chemical.)
- A bursting due to pressure.
- The sound of an explosion.
- A sudden uncontrolled increase.
- A sudden outburst.