The most common and most likely answer to this crossword clue is the 10 letter word BONESHAKER
I've seen this crossword clue in The Daily Telegraph
B
O
N
E
S
H
A
K
E
R
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 = boneshaker.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 BONESHAKER mean?
BONESHAKER noun- A velocipede (the bicycle of the late 1860s).
- Something jolty.