Break in friendly relations (4)
I believe the answer is:
rift
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">break in friendly relations</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 rift that I've seen before include "Breach or quarrel" , "Fissure; split" , "Split (in something)" , "Breach, rupture" , "Cleft in earth or breach in relationship (4)" .)