The most common and most likely answer to this crossword clue is the 8 letter word INCISION
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The straight part
We know that "Cut" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cut = incision.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 INCISION mean?
INCISION noun- A cut, especially one made by a scalpel or similar medical tool in the context of surgical operation; the scar resulting from such a cut.
- The act of cutting into a substance.
- Separation or solution of viscid matter by medicines.