Cryptic crossword clue
Numerical superiority compared with nine, oddly 12

The most common and most likely answer to this crossword clue is the 12 letter word PREDOMINANCE

I've seen this crossword clue in The Sunday Telegraph
P
R
E
D
O
M
I
N
A
N
C
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.
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Crossword Answer definitions

PREDOMINANCE noun
  1. The condition or state of being predominant; ascendancy, domination, preeminence, preponderance.

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