The most common and most likely answer to this crossword clue is the 10 letter word LITERATURE
I've seen this crossword clue in The Times
L
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More clues leading to the result LITERATURE
- What author writes learner gets to repeat when crossing old city
- Temptation to keep repeat short in marketing materials
- True retail arrangement for books and magazines
- Line you are splitting to once again do hand-outs
- Writing “true” tale, I go wrong, penning bit of rubbish
- Books set on fire by English traitor you heard about
- Valued works deconstructing tree ritual
- A lot of reality, true, gets misrepresented in fiction and poetry?
- A volume from America, not the first of adult books?
- Work by Spenser for instance illuminated times by river
Buddy explains!

The straight part
We know that "marketing materials" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case marketing materials = literature.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 LITERATURE mean?
LITERATURE noun- The body of all written works.
- The collected creative writing of a nation, people, group or culture.
- (usually preceded by the) All the papers, treatises etc. published in academic journals on a particular subject.
- Written fiction of a high standard.