They provide accommodation for those in the services (4)
I believe the answer is:
pews
'services' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pews that I've seen before include "Church benches" , "Church seats" , "Church seating" .)