One daughter with a house somewhere in the USA (5)
I believe the answer is:
idaho
'the usa' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'one daughter with a house somewhere' is the wordplay.
'one' becomes 'i' (Roman numeral).
'daughter' becomes 'd' (genealogical abbreviation).
'with' says to put letters next to each other.
'house somewhere' becomes 'ho' (abbreviation for house. I am not sure about the 'somewhere' bit.).
'i'+'d'+'a'+'ho'='IDAHO'
'in' is the link.
Can you help me to learn more?
(Other definitions for idaho that I've seen before include "found in America" , "Pertaining to the Bard" , "North-western state of America" , "My Own Private -- (1991 film)" , "silver-mining state" .)