In Preston I always seek the country (7)
I believe the answer is:
estonia
But I can't explain it at all! Could you help me understand?
(Other definitions for estonia that I've seen before include "So eat in here in Eastern Europe" , "European country, capital Tallinn" , "So eat in poorly on the Baltic Sea" , "Northern European country" , "'So eat in here in Tallinn, say (7)'" .)