Canon entertaining bishops, perhaps, in apartment block (8)
I believe the answer is:
tenement
'apartment block' is the definition.
(I've seen this before)
'canon entertaining bishops perhaps' is the wordplay.
'canon' becomes 'tenet' (I've seen this before).
'entertaining' is an insertion indicator (inviting in, as for dinner).
'bishops perhaps' becomes 'men' (bishop is a kind of man).
'tenet' placed around 'men' is 'TENEMENT'.
'in' acts as a link.
(Other definitions for tenement that I've seen before include "slum housing?" , "Permanent property held by tenant" , "Large residential building" , "Apartment in a US block" , "Run-down building housing many people" .)