Serial set in the country (6)
I believe the answer is:
israel
'the country' is the definition.
(Israel is an example)
'serial set' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'serial' anagrammed gives 'ISRAEL'.
'in' acts as a link.
(Other definitions for israel that I've seen before include "Middle-Eastern country" , "Country of E. Med" , "Eastern Med nation" , "Jewish state" , "Sire, Al is in the Middle East" .)