Rides a bike (6)
I believe the answer is:
cycles
'rides a bike' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cycles that I've seen before include "Recurring rounds of events" , "Recurrent series of events" , "Sequence of songs" , "Complete sets or series of songs or poems" , "Recurring sets of changes; groups of songs" .)