The most common and most likely answer to this crossword clue is the 9 letter word RECORDERS
I've seen this crossword clue in The Guardian
R
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More clues leading to the result RECORDERS
Buddy explains!

The straight part
We know that "Instruments/court officials" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instruments/court officials = recorders.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 RECORDERS mean?
RECORDERS noun- An apparatus for recording; a device which records.
- Agent noun of record; one who records.
- A judge in a municipal court.
- A musical instrument of the woodwind family; a type of fipple flute, a simple internal duct flute.