Business right to secure house for partner (6)
I believe the answer is:
cohort
'partner' is the definition.
(thesaurus)
'business right to secure house' is the wordplay.
'business' becomes 'co'.
'right' becomes 'rt'.
'to secure' is an insertion indicator.
'house' becomes 'ho' (abbreviation for house).
'co'+'rt'='cort'
'cort' enclosing 'ho' is 'COHORT'.
'for' is the link.
(Other definitions for cohort that I've seen before include "Band of warriors" , "Ancient Roman military unit" , "Group of those of approximately the same age -- Roman military unit" , "Tenth part of a Roman legion" , "Band of fighters" .)