Tree maintenance (7)
I believe the answer is:
service
This clue is a double definition.
'tree' is the first definition.
(service tree is a kind of tree)
'maintenance' is the second definition.
(service is a kind of maintenance)
(Other definitions for service that I've seen before include "duty" , "funeral, say" , "Leaving body" , "Religious ceremony" , "Set of dishes" .)