Crossword Genius

Yemen upset rival (5)

Ross

I believe the answer is:

enemy

'rival' is the definition.
(enemy is a kind of rival)

'yemen upset' is the wordplay.
'upset' indicates an anagram.
'yemen' anagrammed gives 'ENEMY'.

(Other definitions for enemy that I've seen before include "is against us" , "Antagonist" , "Division" , "Armed adversary" , "Foe, adversary" .)

I've seen this clue in The Mirror.
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