The most common and most likely answer to this crossword clue is the 10 letter word LAPAROTOMY
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "Opening to examine innards" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case opening to examine innards = laparotomy.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 LAPAROTOMY mean?
LAPAROTOMY noun- The surgical procedure for making an incision in the abdominal wall to gain access into the abdominal cavity. Performed either as exploratory surgery, or as the first step in an abdominal operation.