Cryptic crossword clue
Material on a container outside end of dock to be put into new carton? 9

The most common and most likely answer to this crossword clue is the 9 letter word REPACKAGE

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "put into new carton" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case put into new carton = repackage.
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 REPACKAGE mean?

REPACKAGE verb
  1. To package again, to give new packaging to.

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