I had a house in this state (5)
I believe the answer is:
idaho
'in this state' is the definition.
(I've seen this before)
'i had a house' is the wordplay.
'i had' becomes 'I'd' (contraction).
'house' becomes 'ho' (abbreviation for house).
'id'+'a'+'ho'='IDAHO'
(Other definitions for idaho that I've seen before include "American state, capital Boise (5)" , "North-western state of America" , "US state S. of Montana" , "US state bordering Canada" , "NW state of USA" .)