In principle, the fellows make a place for multi-occupation (8)
I believe the answer is:
tenement
'a place for multi-occupation' is the definition.
I can't judge whether this definition defines the answer.
'in principle the fellows' is the wordplay.
'in' indicates putting letters inside.
'principle' becomes 'tenet' (a tenet is a principle or value).
'the fellows' becomes 'men' (fellow can mean a man).
'tenet' placed around 'men' is 'TENEMENT'.
'make' is the link.
Can you help me to learn more?
(Other definitions for tenement that I've seen before include "Self-contained room or set of rooms" , "Block of flats" , "Building divided into several residences" , "Separate residence within a larger block" , "Multiple-occupancy building" .)