Where the Spokane River begins (5)
I believe the answer is:
idaho
'where the spokane river begins' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for idaho that I've seen before include "Northern US state" , "somewhere in the US" , "US state, capital Boise" , "North-western state of America" , "American state, capital Boise (5)" .)