Not informed United Nations has a battle with Spain (7)
I believe the answer is:
unaware
'not informed' is the definition.
(I've seen this before)
'united nations has a battle with spain' is the wordplay.
'united nations' becomes 'un' ('UN' can be a synonym of 'united nations').
'has' is a charade indicator (letters next to each other).
'battle' becomes 'war' (I've seen this before**).
'with' says to put letters next to each other.
'spain' becomes 'e' (abbreviation for Espana).
'un'+'a'+'war'+'e'='UNAWARE'
(Other definitions for unaware that I've seen before include "Not realising" , "Totally ignorant" , "Uninformed" , "Not conscious of what is going on" , "Unknowing" .)