The most common and most likely answer to this crossword clue is the 11 letter word ELECTROCUTE
I've seen this crossword clue in The Daily Telegraph
E
L
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Buddy explains!
The straight part
We know that "end with a shock?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case end with a shock? = electrocute.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 ELECTROCUTE mean?
ELECTROCUTE verb- To kill by electric shock.
- To execute by electric shock, often by means of an electric chair.
- To inflict a severe electric shock (not necessarily fatal) upon.