Cryptic crossword clue
Newspaper, say, I sat on after one’s tidying 12

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

I've seen this crossword clue in The Daily Telegraph
O
R
G
A
N
I
S
A
T
I
O
N


Buddy explains!

The straight part
We know that "tidying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tidying = organisation.
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 ORGANISATION mean?

ORGANISATION noun
  1. The quality of being organized.
  2. The way in which something is organized, such as a book or an article.
  3. A group of people or other legal entities with an explicit purpose and written rules.
  4. A group of people consciously cooperating.
  5. A major league club and all its farm teams.

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