International alliance (4)
I believe the answer is:
bloc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">international alliance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(group of nations, eg the Eastern bloc)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bloc that I've seen before include "Political alliance" , "Group with a common policy" , "Nations grouped for a purpose" , "Political or economic confederation" , "Group of countries with a shared aim" .)