Cryptic crossword clue
Key one periodically needs is shady quality 10

The most common and most likely answer to this crossword clue is the 10 letter word SHIFTINESS

S
H
I
F
T
I
N
E
S
S

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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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