Native American artist, old man entering American house (7)
I believe the answer is:
arapaho
'native american' is the definition.
(I've seen this before)
'artist old man entering american house' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'old man' becomes 'pa' (both can mean father).
'entering' indicates putting letters inside.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'house' becomes 'ho' (abbreviation for house).
'ra'+'pa'='rapa'
'a'+'ho'='aho'
'rapa' placed inside 'aho' is 'ARAPAHO'.
(Other definitions for arapaho that I've seen before include "North American Indian" , "North American native" , "Indians" , "tribe member" , "Brave" .)