A bicycle's broken - no riding in this state (8)
I believe the answer is:
celibacy
'no riding in this state' is the definition.
'celibacy' can be an answer for 'state' (celibacy is a kind of state). I am not sure about the remainder of the definition.
'a bicycle's broken' is the wordplay.
'broken' indicates anagramming the letters.
'a'+'bicycle'='abicycle'
'abicycle' with letters rearranged gives 'CELIBACY'.
Can you help me to learn more?
(Other definitions for celibacy that I've seen before include "Unmarried state entered in to by some clergy" , "Chastity" , "Sexual abstinence" , "requirement for RC priest" , "Unmarried state on a bicycle" .)