Cryptic crossword clue
One never let a loony put in blank pages 10

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

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "put in blank pages" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case put in blank pages = interleave.
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 INTERLEAVE mean?

INTERLEAVE verb
  1. To insert (pages, which are normally blank) between the pages of a book.
  2. To intersperse (something) at regular intervals between the parts of a thing or between items in a group.
  3. To allocate (things such as successive segments of memory) to different tasks.

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