The most common and most likely answer to this crossword clue is the 10 letter word LIQUIDATOR
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More clues leading to the result LIQUIDATOR
Buddy explains!

The straight part
We know that "Killer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case killer = liquidator.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 LIQUIDATOR mean?
LIQUIDATOR noun- One who liquidates.
- One supporting the political policy of liquidationism; a liquidationist.
- Any of the workers involved in cleaning up the Chernobyl disaster