US state, not a Republican state (6)
I believe the answer is:
kansas
'us state' is the definition.
(I've seen this before)
'not a republican state' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for kansas that I've seen before include "State north of Oklahoma" , "US state, capital Topeka" , "The Sunflower US state" , "State N. of Oklahoma" , "Where Dorothy and Toto lived with Aunt Em" .)