European men in tent or flat (8)
I believe the answer is:
tenement
'flat' is the definition.
(type of apartment building)
'european men in tent' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'in' is an insertion indicator.
'e'+'men'='emen'
'emen' placed within 'tent' is 'TENEMENT'.
'or' acts as a link.
(Other definitions for tenement that I've seen before include "Run-down building housing many people" , "Apartment in a US block" , "Rundown house with many occupants" , "Large residential building" , "living quarters" .)