Potential enemy country (5)
I believe the answer is:
yemen
'country' is the definition.
(I know that Yemen is a country)
'potential enemy' is the wordplay.
'potential' indicates an anagram (another potential order of the letters).
'enemy' anagrammed gives 'YEMEN'.
(Other definitions for yemen that I've seen before include "Arab state" , "Country to south of Saudi Arabia" , "Arabian country, capital San'a" , "Aden is found here" , "Arab country" .)