The most common and most likely answer to this crossword clue is the 10 letter word DISSECTION
I've seen this crossword clue in The Sunday Telegraph
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More clues leading to the result DISSECTION
Buddy explains!

The straight part
We know that "Cutting up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cutting up = dissection.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 DISSECTION mean?
DISSECTION noun- The act of dissecting, or something dissected
- A minute and detailed examination or analysis