The most common and most likely answer to this crossword clue is the 10 letter word VELOCIPEDE
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The straight part
We know that "early form of transport" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case early form of transport = velocipede.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 VELOCIPEDE mean?
VELOCIPEDE noun- An early two-wheeled conveyance upon which one rode astride a wooden frame propelled by means of pushing the feet against the ground.
- Any three- or four-wheeled machine driven by foot or hand levers to the rear or front axle.
- A late-1860s bicycle driven by cranks on the front axle.
- A bicycle.
- To ride on velocipede