Least populous state (7)
I believe the answer is:
wyoming
'least populous state' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for wyoming that I've seen before include "State -- win my go (anag)" , "Last of US states in alphabetical order" , "State of NW US" , "Western US state" , "Mountainous US state" .)