Cryptic crossword clue
On top shelf perhaps, thinner pen 11

The most common and most likely answer to this crossword clue is the 11 letter word HIGHLIGHTER

I've seen this crossword clue in The Sunday Telegraph
H
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Buddy explains!

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

HIGHLIGHTER noun
  1. A marker pen used to highlight text.
  2. A cosmetic product that reflects light, used to emphasize the contours of the face etc.
  3. That which highlights or emphasizes something.

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