Service — convenience (7)
I believe the answer is:
amenity
I believe this clue is a double definition.
'service' is the first definition.
(I know that amenity is a type of service)
'convenience' is the second definition.
(I've seen this in another clue)
(Other definitions for amenity that I've seen before include "Desirable or useful feature of a place" , "Building's useful feature" , "Any time for convenience or pleasentness" , "Pleasing facility" , "type of hospital bed" .)