The most common and most likely answer to this crossword clue is the 13 letter word CONTAINERISED
I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "freight in this form?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case freight in this form? = containerised.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 CONTAINERISED mean?
CONTAINERISED adjective- Of freight, packed in a container for transport.
- To transport (cargo) in large, standard containers.
- To modify (a ship or industry) to use such containers.
- (of an application) To run an application in a container.