A conflict between UN and Spain is unenlightened (7)
I believe the answer is:
unaware
'unenlightened' is the definition.
(thesaurus)
'a conflict between un and spain' is the wordplay.
'conflict' becomes 'war' (war is a kind of conflict).
'between' indicates putting letters inside.
'and' is a charade indicator (letters next to each other).
'spain' becomes 'e' (abbreviation for Espana).
'a'+'war'='awar'
'un'+'e'='une'
'awar' going into 'une' is 'UNAWARE'.
'is' is the link.
(Other definitions for unaware that I've seen before include "Heedless" , "Nescient" , "Lacking knowledge (of a situation or fact)" , "Ignorant, oblivious" , "Unwitting, not knowing" .)