No longer active or practising (6)
I believe the answer is:
lapsed
'no longer active or practising' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lapsed that I've seen before include "Fallen away from the faith" , "declined" , "Expired, ran out" , "No longer active or practising" , "Expired over pedals" .)