In America, the unmarried state (4)
I believe the answer is:
miss
'state' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for miss that I've seen before include "Fail to attend (event)" , "Single girl" , "Fail to meet - girl" , "Omit" , "Pine for - young lady" .)