Cryptic crossword clue
Crucial genius regularly dreamt about item needed by staff 3,9

The most common and most likely answer to this crossword clue is the 3 plus 9 letter word KEY SIGNATURE

I've seen this crossword clue in Independent
K
E
Y
S
I
G
N
A
T
U
R
E

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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.

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