The most common and most likely answer to this crossword clue is the 5 letter word KETCH
I've seen this crossword clue in The Times
K
E
T
C
H
More clues leading to the result KETCH
Buddy explains!

The straight part
We know that "Executioner/craft" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case executioner/craft = ketch.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 KETCH mean?
KETCH noun- A fore-and-aft rigged sailing vessel with two masts, main and mizzen, the mizzen being stepped forward of the rudder post.
- (heading) To capture, overtake.
- (heading) To seize hold of.
- (heading) To intercept.
- (heading) To receive (by being in the way).
- (heading) To take in with one's senses or intellect.
- (heading) To seize attention, interest.
- (heading) To obtain or experience
- A hangman.
- To hang.