The most common and most likely answer to this crossword clue is the 8 letter word CORONERS
I've seen this crossword clue in The Daily Telegraph
C
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Buddy explains!
The straight part
We know that "Public officials required to take stiff examinations" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case public officials required to take stiff examinations = coroners.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 CORONERS mean?
CORONERS noun- A public official who presides over an inquest into unnatural deaths, cases of treasure trove, and debris from shipwrecks.
- A medical doctor who performs autopsies and determines time and cause of death from a scientific standpoint.
- The administrative head of a sheading.