The most common and most likely answer to this crossword clue is the 12 letter word COBBLESTONES
I've seen this crossword clue in The Times
C
O
B
B
L
E
S
T
O
N
E
S
More clues leading to the result COBBLESTONES
Buddy explains!
The straight part
We know that "no fun here on bike" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case no fun here on bike = cobblestones.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 COBBLESTONES mean?
COBBLESTONES noun- A rounded stone from a river bed, fit for use as ballast in ships and for paving roads.
- The material made from cobblestones.