Looking for vehicle with key ongoing service (9)
I believe the answer is:
aftercare
'ongoing service' is the definition.
(ongoing care)
'looking for vehicle with key' is the wordplay.
'looking for' becomes 'after' (both can mean on the hunt for something).
'vehicle' becomes 'car' (car is a kind of vehicle).
'with' means one lot of letters go next to another.
'key' becomes 'e' (musical key).
'after'+'car'+'e'='AFTERCARE'
(Other definitions for aftercare that I've seen before include "Support to customer following a purchase" , "Treatment following release" , "Follow-up support" .)