Friendly nation (4)
I believe the answer is:
ally
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">friendly nation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ally that I've seen before include "One on one's side" , "One in cooperation with another" , "Someone with whom one is in league" , "Band together" , "Co-operating person or nation" .)