Crossword Genius

Yemen upset foe (5)

Ross

I believe the answer is:

enemy

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

'yemen upset' is the wordplay.
'upset' is an anagram indicator.
'yemen' is an anagram of 'ENEMY'.

(Other definitions for enemy that I've seen before include "Yemen (anag.)" , "Foe, adversary" , "Armed adversary" , "Hostile opponent" , "one in opposition" .)

I've seen this clue in The Mirror and The Daily Express.
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