The most common and most likely answer to this crossword clue is the 7 letter word SLAYING
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Buddy explains!
The straight part
We know that "murder" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case murder = slaying.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 SLAYING mean?
SLAYING verb- To kill, murder.
- To eradicate or stamp out.
- (by extension) To defeat, overcome (in a competition or contest).
- To delight or overwhelm, especially with laughter.
- To amaze, stun or otherwise incapacitate by awesomeness; to be awesome at something; to kill (slang sense).
- To have sex with
- Killing, especially the murder of a human.