The most common and most likely answer to this crossword clue is the 14 letter word ROLLER-COASTER
I've seen this crossword clue in The Times
R
O
L
L
E
R
-
C
O
A
S
T
E
R
Buddy explains!
The straight part
We know that "dizzying experience" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dizzying experience = roller-coaster.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 ROLLER-COASTER mean?
ROLLER-COASTER noun- An amusement ride consisting of a buggy on a track that rises, falls, twists and turns.
- (by extension) Any situation in which there are ups and downs, or violent changes.