Northern Ireland, Germany, and another country (5)
I believe the answer is:
niger
'country' is the definition.
(African country)
'northern ireland germany' is the wordplay.
'northern ireland' becomes 'NI' (abbreviation).
'germany' becomes 'ger' (I've seen this in other clues).
'ni'+'ger'='NIGER'
'and another' acts as a link.
(Other definitions for niger that I've seen before include "West African country, capital Niamey" , "Land-locked country and river of W Africa" , "West African republic" , "The black" , "Country W. of Chad" .)