Country fair Jack missed in song (7)
I believe the answer is:
austria
'country' is the definition.
(Austria is an example)
I don't understand how the remainder of the clue works.
(Other definitions for austria that I've seen before include "EU country" , "USA art I send to European state" , "Central European republic" , "US tiara to be found in this country, oddly" , "Central European country" .)