Replacement janitor (9)
I believe the answer is:
caretaker
This could be a double definition.
'replacement' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'janitor' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for caretaker that I've seen before include "exercising temporary control" , "Person in temporary charge" , "Warden" , "One looking after a building" , "Janitor" .)