The "Show Me" State (8)
I believe the answer is:
missouri
'the show me state' is the definition.
('Missouri' can be a synonym of 'show me state')
This is the entire clue.
(Other definitions for missouri that I've seen before include "American state's" , "River nicknamed Big Muddy" , "24th American state to join the Union, 1821" , "State of central US" , "State of central USA" .)