Cryptic crossword clue
A cur ill-disposed to get into festivity — more so than usual 12

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

I've seen this crossword clue in The Guardian
P
A
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Y

Buddy explains!

The straight part
We know that "more so than usua" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more so than usua = particularly.
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 PARTICULARLY mean?

PARTICULARLY adverb
  1. (focus) Especially, extremely.
  2. (degree) To a great extent.
  3. Specifically, uniquely or individually.
  4. In detail; with regard to particulars.
  5. In a particular manner; fussily.

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