Serial involving a country (6)
I believe the answer is:
israel
'a country' is the definition.
(I know that Israel is a country)
'serial involving' is the wordplay.
'involving' indicates anagramming the letters.
'serial' with letters rearranged gives 'ISRAEL'.
(Other definitions for israel that I've seen before include "Sir, ale is available in the country" , "Serial about middle east country" , "Jewish state" , "Zion" , "Serial about middle-east state" .)