Expired pedals falling apart (6)
I believe the answer is:
lapsed
'expired' is the definition.
(I've seen this in another clue)
'pedals falling apart' is the wordplay.
'falling apart' is an anagram indicator.
'pedals' is an anagram of 'LAPSED'.
(Other definitions for lapsed that I've seen before include "Pleads, having failed to maintain standards" , "Pleads (anag)" , "Expired over pedals" , "Expired, ran out" , "Fallen away from the faith" .)