Schoolboy briefly touring southern country (7)
I believe the answer is:
estonia
'country' is the definition.
(European country)
'schoolboy briefly touring southern' is the wordplay.
'schoolboy' becomes 'etonian' (I've seen this before).
'briefly' means to remove the last letter.
'touring' indicates putting letters inside (touring can mean going round).
'southern' becomes 's' (abbreviation).
'etonian' with its last letter removed is 'etonia'.
'etonia' going around 's' is 'ESTONIA'.
(Other definitions for estonia that I've seen before include "So eat in about here in Northern Europe" , "Country on the Baltic Sea" , "So eat in here in Eastern Europe" , "'So eat in here in Tallinn, say (7)'" , "Republic in northeastern Europe" .)