The most common and most likely answer to this crossword clue is the 10 letter word TETRAMETER
I've seen this crossword clue in The Daily Telegraph
T
E
T
R
A
M
E
T
E
R
More clues leading to the result TETRAMETER
- Vehicle passes through rock in a line
- Arrangement of feet, having to stagger round vehicle
- Rock thrown over tram line
- Move unsteadily across tramline
- Wobble engulfs public transport line
- Move precariously around vehicle that’s four feet long
- One has four feet, is encountered in wild retreat
- Four-footed form of vehicle to wobble about
- Carriage in wobble in line of four
- Move unsteadily around vehicle in a sort of line
Buddy explains!

The straight part
We know that "One has four feet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one has four feet = tetrameter.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 TETRAMETER mean?
TETRAMETER noun- A line in a poem having four metrical feet.
- A poetic metre in which each line has four feet.