A bike loop (5)
I believe the answer is:
cycle
I believe this clue is a double definition.
'a bike' is the first definition.
(I've seen this before)
'loop' is the second definition.
(thesaurus)
(Other definitions for cycle that I've seen before include "Recurring sequence" , "Regularly repeated sequence (of events)" , "Repeating sequence" , "Pushbike" , "The age" .)