Absolutely not about the end of summer in the country (6)
I believe the answer is:
Here is my best explanation:
'country' is the definition.
(Norway is an example)
'absolutely not about the end of summer' is the subsidiary indication.
'absolutely not' becomes 'noway' (I've seen this before).
'about' means one lot of letters goes inside another.
'the end of' indicates one should take the final letters.
The final letter of 'summer' is 'r'.
'noway' enclosing 'r' is 'norway'.
'in the' is the link.
(Other definitions for norway that I've seen before include "Trondheim country", "Any row in this strange country?", "Land of fjords", "North European country", "European kingdom", "Country of fjords", "Grieg, Ibsen country", "Grieg's land", "See twelve across" and "Scandinavian country".)