The most common and most likely answer to this crossword clue is the 8 letter word CLARENCE
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Buddy explains!
The straight part
We know that "form of transport" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case form of transport = clarence.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 CLARENCE mean?
CLARENCE noun- A kind of carriage popular in the 19th century; a four-wheeled horse-driven vehicle with a glass front and room for four passengers.