The most common and most likely answer to this crossword clue is the 7 letter word KNIFING
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More clues leading to the result KNIFING
Buddy explains!

The straight part
We know that "stabbing with dagger" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stabbing with dagger = knifing.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 KNIFING mean?
KNIFING verb- To cut with a knife.
- To use a knife to injure or kill by stabbing, slashing, or otherwise using the sharp edge of the knife as a weapon.
- To cut through as if with a knife.
- To betray, especially in the context of a political slate.
- To positively ignore, especially in order to denigrate. compare cut
- An instance of stabbing with a knife.