Yemen upset foe (5)

I believe the answer is:

enemy

'foe' is the definition.
(I know that foe can be written as enemy)

'yemen upset' is the wordplay.
'upset' is an anagram indicator.
'yemen' anagrammed gives '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 Daily Express and The Mirror.

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