The most common and most likely answer to this crossword clue is the 4 plus 6 letter word POST MORTEM
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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 POST MORTEM mean?
POST MORTEM noun- An investigation of a corpse to determine the cause of death.
- Any investigation after the conclusion of an activity, particularly when said activity produces an unwanted outcome.