Cryptic crossword clue
Killing donkey is against new orders 13

The most common and most likely answer to this crossword clue is the 13 letter word ASSASSINATING

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Buddy explains!

The straight part
We know that "Killing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case killing = assassinating.
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.

Crossword Answer definitions

ASSASSINATING verb
  1. To murder someone, especially an important person, by a sudden or obscure attack, especially for ideological or political reasons.
  2. To harm, ruin, or defame severely or destroy by treachery, slander, libel, or obscure attack.

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