Foe from Yemen, possibly (5)
I believe the answer is:
enemy
'foe' is the definition.
(I know that foe can be written as enemy)
'yemen possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'yemen' anagrammed gives 'ENEMY'.
'from' is the link.
(Other definitions for enemy that I've seen before include "Time" , "one in opposition" , "Division" , "Antagonist" , "Yemen (anag.)" .)