Drivers touring as far as I can see leaving house in a state (7)
I believe the answer is:
arizona
'a state' is the definition.
(Arizona is a US state)
'drivers touring as far as i can see leaving house' is the wordplay.
'drivers' becomes 'AA' (Automobile Association).
'touring' means one lot of letters goes inside another (tour can mean to go around).
'as far as i can see' becomes 'horizon' (you can't see beyond the horizon).
'leaving' is a deletion indicator.
'house' becomes 'ho' (abbreviation for house).
'horizon' with 'ho' taken away is 'rizon'.
'aa' enclosing 'rizon' is 'ARIZONA'.
'in' acts as a link.
(Other definitions for arizona that I've seen before include "American state, capital Phoenix" , "State of southern US" , "Dry US state" , "US state containing the Grand Canyon" , "somewhere in America" .)