The most common and most likely answer to this crossword clue is the 5 plus 10 letter word CROSS REFERENCES
I've seen this crossword clue in The Guardian
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More clues leading to the result CROSS REFERENCES
Buddy explains!
The straight part
We know that "some of this puzzle’s content" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some of this puzzle’s content = cross references.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 CROSS REFERENCES mean?
CROSS REFERENCES noun- A reference or direction in one place in a book or other source of information to information at another place in the same work