The most common and most likely answer to this crossword clue is the 13 letter word ELECTROCUTION
I've seen this crossword clue in The Times
E
L
E
C
T
R
O
C
U
T
I
O
N
Buddy explains!
The straight part
We know that "shocking" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shocking = electrocution.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 ELECTROCUTION mean?
ELECTROCUTION noun- The accidental death or suicide by electric shock.
- Deliberate execution by electric shock, usually involving an electric chair.
- A severe electric shock, whether fatal or not.