The most common and most likely answer to this crossword clue is the 13 letter word ELECTROCUTING
E
L
E
C
T
R
O
C
U
T
I
N
G
Buddy explains!
The straight part
We know that "executing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case executing = electrocuting.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 ELECTROCUTING mean?
ELECTROCUTING 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.