The most common and most likely answer to this crossword clue is the 7 letter word CYCLIST
I've seen this crossword clue in The Times
C
Y
C
L
I
S
T
More clues leading to the result CYCLIST
- Rider put composer on the couch, it's said
- Road user growth swelled by 151
- Wheeler‘s modest loveless description of low-level celebrity?
- Chris Hoy? On vacation, he’s not really famous
- Small quantitygiven to lean rider
- Rider in Confederacy's last two campaigns, primarily by inclination
- Self-powered individual having left with cystic abnormality
- One on two wheels in Cyprus, not a top celebrity!
Buddy explains!

The straight part
We know that "Road user" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case road user = cyclist.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 CYCLIST mean?
CYCLIST noun- A person who rides a cycle, especially a bicycle, or who habitually engages in cycling.
- A user of the software language CycL.