Group of allied nations (4)
I believe the answer is:
bloc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">group of allied nations</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bloc that I've seen before include "Axis (political)" , "Political grouping of countries" , "Alliance - coalition" , "-- Forsyth, entertainer" , "International alliance" .)