Army unit or company with the right to keep house! (6)
I believe the answer is:
cohort
'army' is the definition.
(thesaurus)
'company with the right to keep house' is the wordplay.
'company' becomes 'co' (abbreviation).
'with' says to put letters next to each other.
'the right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'to keep' is an insertion indicator.
'house' becomes 'ho' (abbreviation for house).
'co'+'rt'='cort'
'cort' enclosing 'ho' is 'COHORT'.
'unit or' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cohort that I've seen before include "Tenth part of a Roman legion" , "Ancient Roman military unit" , "Group of similar people" , "Group with a shared characteristic - unit of Roman legion" , "Group of those of approximately the same age -- Roman military unit" .)