Maintenance ceremony? (7)
I believe the answer is:
service
I believe this clue is a double definition.
'maintenance' is the first definition.
(I know that service is a type of maintenance)
'ceremony?' is the second definition.
(I know that service is a type of religious ceremony)
(Other definitions for service that I've seen before include "Tennis opening shot" , "Church ceremony" , "See 11" , "navy, for example" , "Act of worship" .)