Yemen overcame opponent (5)
I believe the answer is:
enemy
'opponent' is the definition.
(I know that enemy is a type of opponent)
'yemen overcame' is the wordplay.
'yemen' anagrams to 'ENEMY'.
However, I'm not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for enemy that I've seen before include "Time" , "Armed adversary" , "other side (like 16)" , "is against us" , "Yemen (anag.)" .)